[issue21052] Consider dropping ImportWarning for empty sys.path_hooks and sys.meta_path

[Brett Cannon]

Brett Cannon added the comment:

It's a simple `if not sys.meta_path` check so it doesn't differentiate. But that's actually a good point about it being None in this case due to the shutdown; if the check changed to `if sys.meta_path is not None and len(sys.meta_path) == 0` then that should skip the shutdown issue while keeping the warning around.

Definitely going to be one of those instances where the tests are going to be more troublesome than the fix. =)

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keywords: +easy
stage: needs patch -> test needed
versions: +Python 3.5

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