[issue14605] Make import machinery explicit

[Roundup Robot]

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

New changeset 7025ee00dbf6 by Brett Cannon in branch 'default':
Issue #14605: Use None in sys.path_importer_cache to represent no
http://hg.python.org/cpython/rev/7025ee00dbf6

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