[issue12420] distutils crashes if PATH is not defined

[Henry Precheur]

Henry Precheur <henry at precheur.org> added the comment:

I don't know exactly in which context find_executable should be used,
but after taking a closer look it seems that returning None when PATH is
not defined could "work".

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12420>
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