Unhandled exception in unicode_utils

[ghost]

Originally reported by: bra (Bitbucket: bra, GitHub: bra)

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Hi,

According to the python docs, sys.getfilesystemencoding() can return None.
But the code here:
https://bitbucket.org/pypa/setuptools/src/cf547c694dc5a4f51623e4c5f944322ef9093e16/setuptools/unicode_utils.py?at=default&fileviewer=file-view-default#unicode_utils.py-31
gets TypeError instead of UnicodeDecodeError if None is supplied:

Python 2.7.11 (default, Dec 20 2015, 01:15:21) 
[GCC 4.2.1 Compatible FreeBSD Clang 3.4.1 (tags/RELEASE_34/dot1-final 208032)] on freebsd10
Type "help", "copyright", "credits" or "license" for more information.
>>> 'test'.decode(None)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: decode() argument 1 must be string, not None

Which doesn't handled, so the code fails on it when sys.getfilesystemencoding() is None.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/486

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Add test capturing failure. Ref #486.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Avoid TypeError when getfilesystemencoding returns None. Fixes #486.