error running, content referenced before assignment and object of type 'NoneType' has no len()

[cvernooy23]

python
Python 3.7.5 (default, Nov  1 2019, 02:16:32) 
[Clang 11.0.0 (clang-1100.0.33.8)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from ansidoc import Ansidoc
>>> ansidoc = Ansidoc(dirpath='/full/path/to/ansible/project/roles')
>>> ansidoc.run()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.7/site-packages/ansidoc/ansidoclib.py", line 118, in run
    self._make_role_doc(os.path.join(self.dirpath, role))
  File "/usr/local/lib/python3.7/site-packages/ansidoc/ansidoclib.py", line 62, in _make_role_doc
    os.path.join(rolepath, "docs"), self.verbose)
  File "/usr/local/lib/python3.7/site-packages/ansidoc/helpers.py", line 32, in load_yml_files
    return content
UnboundLocalError: local variable 'content' referenced before assignment

ansidoc -p /full/path/to/ansible/project/roles
Traceback (most recent call last):
  File "/usr/local/bin/ansidoc", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/site-packages/ansidoc/__main__.py", line 33, in main
    exit_code = cli.run(**vars(args))
  File "/usr/local/lib/python3.7/site-packages/ansidoc/cli.py", line 53, in run
    ansidoc.run()
  File "/usr/local/lib/python3.7/site-packages/ansidoc/ansidoclib.py", line 114, in run
    if len(exclude_list) > 0:
TypeError: object of type 'NoneType' has no len()

[angeloxx]

The script requires that role directory contains ./docs directory, even if empty

[rod7760]

While I do understand that it requires an empty docs dir, this seems like an unnecessary restriction. Is there a particular reason this is done?