[issue38215] Do not import modules in star-import when __all__ is not defined.

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

I don't think this is worth the code breakage.

The advice already given is not to use `import *` unless:

- the module was designed for that usage; or
- you know what you are doing.

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nosy: +ethan.furman

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38215>
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