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Improve error if python can't run pep8
Summary: On systems with an ancient version of python, the pep8 linter won't run. Instead of blowing up in the user's face, we should display a nice error message. Test Plan: Put /usr/bin (where the ancient version of python is) at the beginning of my path and tried to lint some python. I got a nice error instead of a stack trace. Reviewers: epriestley, wez Reviewed By: epriestley CC: aran, Korvin Differential Revision: https://secure.phabricator.com/D5356
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