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

[daniel hahler]

daniel hahler added the comment:

Please note that I have noticed this not because of setting it via `os.environ`, but because a program using `os.environ.clear()` crashed:
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1281086

I cannot say how this unusual entry was added to the environment, but it showed up in `env` and therefore it is possible somehow.

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