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As noted in #15314, one of the pkgutil tests was failing on Windows because pkgutil.get_importer("") was returning None. On my Fedora system it returns FileFinder(".").
I've now tweaked that particular test to use a bogus path string so that None is the expected result on all platforms.
However, the cross-platform discrepancy is a little disturbing - I would have expected the operation to either fail or succeed regardless of platform.
Since pkgutil.get_importer is now just a wrapper that takes care of checking path_importer_cache and then walking sys.path_hooks, I believe the actual culprit is FileFinder.path_hook()("") returning None (I'm currently downloading and installing 3.3b1 on my gaming machine to confirm that)