Module fails to import when Python is ran with -OO

[jruere]

Since -OO removes docstrings, the module fails on import as shown in the following trace:

[...]
    from cloudpathlib import AnyPath, CloudPath
  File "/home/javier/.virtualenvs/WebsiteTopicClassifier/lib/python3.6/site-packages/cloudpathlib/__init__.py", line 3, in <module>
    from .anypath import AnyPath
  File "/home/javier/.virtualenvs/WebsiteTopicClassifier/lib/python3.6/site-packages/cloudpathlib/anypath.py", line 5, in <module>
    from .cloudpath import InvalidPrefixError, CloudPath
  File "/home/javier/.virtualenvs/WebsiteTopicClassifier/lib/python3.6/site-packages/cloudpathlib/cloudpath.py", line 136, in <module>
    class CloudPath(metaclass=CloudPathMeta):
  File "/home/javier/.virtualenvs/WebsiteTopicClassifier/lib/python3.6/site-packages/cloudpathlib/cloudpath.py", line 127, in __init__
    docstring = getattr(Path, attr).__doc__ + " _(Docstring copied from pathlib.Path)_"
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

[pjbull]

Thanks @jruere. We'd accept a PR that adds a condition to the ones that we check ahead of failure to also check that __doc__ is not None:

cloudpathlib/cloudpathlib/cloudpath.py

Lines 122 to 126 in 20b79c1

	if (
	not attr.startswith("_")
	and hasattr(Path, attr)
	and hasattr(getattr(Path, attr), "__doc__")
	):

[pjbull]

@jruere This is released now in version 0.10.0 on PyPI

[jruere]

Much appreciated!

…

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