[issue30767] logging must check exc_info correctly

[Matthew Patton]

Matthew Patton <pattonme at yahoo.com> added the comment:

I've triggered it which is why I looked for the problem and offered the defensive patch. As API writers you can NEVER assume your parameters are what you think they should be and just blindly proceed.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30767>
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