Commits on Jun 5, 2018

1. Fix exception on import in MacOS

   This is related to my fix in #658. Apparently, MacOS adds a git
   executable that is just a stub which displays an error. This gets past
   the try/except I added in #658, and allows all of the GitPython
   components to be imported, but since the executable is not *actually*
   git, it results in an exception when ``refresh()`` attemepts to run a
   ``git version``.

   

   authored and Byron committed

   Jun 5, 2018
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