Fix failing rtd build

[pheuer]

No description provided.

[pheuer]

First issue had to do with a module with no docstring.

Now getting

Running Sphinx v7.3.7
making output directory... done
[autosummary] generating autosummary for: index.rst, notebooks/applying_cuts_to_a_cpsa_file.ipynb, notebooks/filtration_stacks.ipynb, notebooks/nuclear_reaction_data.ipynb, usage.rst
loading intersphinx inventory from https://docs.python.org/3/objects.inv...
loading intersphinx inventory from https://www.sphinx-doc.org/en/master/objects.inv...
[AutoAPI] Reading files... [  5%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/__init__.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/__init__.py
[AutoAPI] Reading files... [ 11%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/srim.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/srim.py
[AutoAPI] Reading files... [ 16%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/__init__.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/__init__.py
[AutoAPI] Reading files... [ 21%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/stack.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/filtration/stack.py
[AutoAPI] Reading files... [ 26%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/base_scan.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/base_scan.py
[AutoAPI] Reading files... [ 32%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/_cli.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/_cli.py
[AutoAPI] Reading files... [ 37%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/__init__.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/__init__.py
[AutoAPI] Reading files... [ 42%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/cpsa.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/cpsa.py
[AutoAPI] Reading files... [ 47%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/subset.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/subset.py
[AutoAPI] Reading files... [ 53%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/cut.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/scan/cut.py
[AutoAPI] Reading files... [ 58%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/ci.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/ci.py
[AutoAPI] Reading files... [ 63%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/exportable_class.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/exportable_class.py
[AutoAPI] Reading files... [ 68%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/types.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/types.py
[AutoAPI] Reading files... [ 74%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/__init__.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/__init__.py
[AutoAPI] Reading files... [ 79%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/units.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/units.py
[AutoAPI] Reading files... [ 84%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/data.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/core/data.py
[AutoAPI] Reading files... [ 89%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/fusion.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/fusion.py
[AutoAPI] Reading files... [ 95%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/__init__.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/__init__.py
[AutoAPI] Reading files... [100%] /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/response.py
WARNING: Unable to read file: /home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/src/cr39py/models/response.py

[AutoAPI] Mapping Data... 
[AutoAPI] Rendering Data... 
WARNING: No modules were rendered. Do you need to set autoapi_options to render additional objects?
building [mo]: targets for 0 po files that are out of date
writing output... 
building [html]: targets for 5 source files that are out of date
updating environment: [new config] 5 added, 0 changed, 0 removed
reading sources... [ 20%] index
[AutoAPI] Adding AutoAPI TOCTree [autoapi/index] to index.rst
reading sources... [ 40%] notebooks/applying_cuts_to_a_cpsa_file
reading sources... [ 60%] notebooks/filtration_stacks
reading sources... [ 80%] notebooks/nuclear_reaction_data
reading sources... [100%] usage

/home/docs/checkouts/readthedocs.org/user_builds/cr39py/checkouts/14/docs/source/index.rst:11: WARNING: toctree contains reference to nonexisting document 'autoapi/index'
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets... copying static files... done
copying extra files... done
done
writing output... [ 20%] index

====================== slowest reading durations =======================
0.671 notebooks/applying_cuts_to_a_cpsa_file
0.613 notebooks/filtration_stacks
0.514 notebooks/nuclear_reaction_data
0.018 index
0.003 usage

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/events.py", line 97, in emit
    results.append(listener.handler(self.app, *args))
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/nbsphinx/__init__.py", line 1753, in doctree_resolved
    title = app.env.titles[doc].astext()
            ~~~~~~~~~~~~~~^^^^^
KeyError: 'autoapi/index'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/cmd/build.py", line 337, in build_main
    app.build(args.force_all, args.filenames)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/application.py", line 351, in build
    self.builder.build_update()
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 293, in build_update
    self.build(to_build,
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 362, in build
    self.write(docnames, list(updated_docnames), method)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 570, in write
    self._write_serial(sorted(docnames))
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/builders/__init__.py", line 577, in _write_serial
    doctree = self.env.get_and_resolve_doctree(docname, self)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/environment/__init__.py", line 638, in get_and_resolve_doctree
    self.apply_post_transforms(doctree, docname)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/environment/__init__.py", line 696, in apply_post_transforms
    self.events.emit('doctree-resolved', doctree, docname)
  File "/home/docs/checkouts/readthedocs.org/user_builds/cr39py/envs/14/lib/python3.12/site-packages/sphinx/events.py", line 108, in emit
    raise ExtensionError(
sphinx.errors.ExtensionError: Handler <function doctree_resolved at 0x7fa159282160> for event 'doctree-resolved' threw an exception (exception: 'autoapi/index')

Extension error (nbsphinx):
Handler <function doctree_resolved at 0x7fa159282160> for event 'doctree-resolved' threw an exception (exception: 'autoapi/index')

which looks like: readthedocs/readthedocs.org#11975

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.39%. Comparing base (dbb0cce) to head (4cb9f7e).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   89.39%   89.39%           
=======================================
  Files          15       15           
  Lines        1122     1122           
=======================================
  Hits         1003     1003           
  Misses        119      119           

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