Missing resources.yml not handled properly

[MehmedGIT]

In some cases, when the ~/.config/ocrd/resources.yml file is completely missing, the ocrd resmgr does not report that properly.

(venv38-core) mm@MM-Notebook:~/repos/core$ ocrd resmgr download ocrd-tesserocr-recognize '*'
/home/mm/venv38-core/lib/python3.8/site-packages/requests/__init__.py:109: RequestsDependencyWarning: urllib3 (2.1.0) or chardet (None)/charset_normalizer (3.3.2) doesn't match a supported version!
  warnings.warn(
11:45:00.255 ERROR ocrd.cli.resmgr - Executable 'ocrd-tesserocr-recognize' is not installed. To download resources anyway, use the -a/--allow-uninstalled flag
(venv38-core) mm@MM-Notebook:~/repos/core$ ocrd resmgr download -a ocrd-tesserocr-recognize '*'
/home/mm/venv38-core/lib/python3.8/site-packages/requests/__init__.py:109: RequestsDependencyWarning: urllib3 (2.1.0) or chardet (None)/charset_normalizer (3.3.2) doesn't match a supported version!
  warnings.warn(
11:45:05.814 INFO ocrd.cli.resmgr - Executable ocrd-tesserocr-recognize is not installed, but downloading resources anyway
11:45:05.814 INFO ocrd.cli.resmgr - No resources None found in registry for executable ocrd-tesserocr-recognize

[bertsky]

Even worse, in my case (ocrd==c8aef091e18ce4e79cb3a3b7399ac908c90a169d), the processor is already installed, but resmgr crashes:

ocrd resmgr download ocrd-tesserocr-recognize frak2021.traineddata

Traceback (most recent call last):
  File "/data/ocr-d/ocrd_all/venv38/bin/ocrd", line 8, in <module>
    sys.exit(cli())
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/data/ocr-d/ocrd_all/venv38/lib/python3.8/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/data/ocr-d/ocrd_all/core/src/ocrd/cli/resmgr.py", line 92, in download
    resmgr = OcrdResourceManager()
  File "/data/ocr-d/ocrd_all/core/src/ocrd/resource_manager.py", line 46, in __init__
    self.save_user_list()
  File "/data/ocr-d/ocrd_all/core/src/ocrd/resource_manager.py", line 70, in save_user_list
    with open(self.user_list, 'w', encoding='utf-8') as f:
FileNotFoundError: [Errno 2] No such file or directory: '/home/bertsky/.config/ocrd/resources.yml'

(The resources.yml in question is a broken symlink. Still, resmgr should tolerate this, ignoring the user config.)