[issue20658] os.environ.clear() fails with empty keys (posix.unsetenv)

[Terry J. Reedy]

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


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versions: +Python 3.11 -Python 2.7, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue20658>
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