[issue12599] Use 'is not None' where appropriate in importlib

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset c1399cf7bd6a by Brett Cannon in branch 'default':
Issue #12599: Be more strict in accepting None vs. a false-like object
http://hg.python.org/cpython/rev/c1399cf7bd6a

----------
nosy: +python-dev

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12599>
_______________________________________