[issue43913] unittest module cleanup functions not run unless tearDownModule() is defined

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> needs patch
versions: +Python 3.10, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43913>
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