fix ValueError: max() arg is an empty sequence #1
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When running `tox -l` with a tox.ini file not containing any default environments, instead of an empty output, an exception is raised:
```
$ tox -l
tox -l
Traceback (most recent call last):
File "/Users/jq/.pyenv/versions/py38/bin/tox", line 8, in <module>
sys.exit(cmdline())
File "/Users/jq/.pyenv/versions/3.8.1/envs/py38/lib/python3.8/site-packages/tox/session/__init__.py", line 44, in cmdline
main(args)
File "/Users/jq/.pyenv/versions/3.8.1/envs/py38/lib/python3.8/site-packages/tox/session/__init__.py", line 68, in main
exit_code = session.runcommand()
File "/Users/jq/.pyenv/versions/3.8.1/envs/py38/lib/python3.8/site-packages/tox/session/__init__.py", line 189, in runcommand
self.showenvs(all_envs=False, description=show_description)
File "/Users/jq/.pyenv/versions/3.8.1/envs/py38/lib/python3.8/site-packages/tox/session/__init__.py", line 293, in showenvs
show_envs(self.config, all_envs=all_envs, description=description)
File "/Users/jq/.pyenv/versions/3.8.1/envs/py38/lib/python3.8/site-packages/tox/session/commands/show_env.py", line 14, in show_envs
max_length = max((len(env) for env in (default + extra)))
ValueError: max() arg is an empty sequence
```
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Closes tox-dev#1343.
When running
tox -lwith a tox.ini file not containing any default environments, instead of an empty output, an exception is raised: