[issue19410] Restore empty string special casing in importlib.machinery.FileFinder

[Roundup Robot]

Roundup Robot added the comment:

New changeset 17d730d37b2f by Brett Cannon in branch 'default':
Issue #19410: Put back in special-casing of '' for
http://hg.python.org/cpython/rev/17d730d37b2f

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nosy: +python-dev

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<http://bugs.python.org/issue19410>
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