[3.7] bpo-33169: Remove values of None from sys.path_importer_cache when invalidating caches (GH-6402)#6403
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… when invalidating caches (pythonGH-6402) An entry of None in sys.path_importer_cache represents a negative/missing finder for a path, so clearing it out makes sense.. (cherry picked from commit 9e2be60) Co-authored-by: Brett Cannon <brettcannon@users.noreply.github.com>
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An entry of None in sys.path_importer_cache represents a negative/missing finder for a path, so clearing it out makes sense..
(cherry picked from commit 9e2be60)
https://bugs.python.org/issue33169