GitPython should tolerate comparisons between None and Commits

[mike-perdide]

Using GitPython 0.3.1, I find myself often catching this exception :

  File "/home/mike/.virtualenvs/qgb/lib/python2.6/site-packages/GitPython-0.3.1-py2.6.egg/git/objects/base.py", line 80, in __eq__
    return self.binsha == other.binsha
AttributeError: 'NoneType' object has no attribute 'binsha'

It occurs when I try to compare a None object to a commit. I think this could be enhanced in objects/base.py by returning False if "other" has no 'binsha' attribute.

[Byron]

This has been implemented in 0.3 and master, and will make it into the next release, 0.3.2.