[issue34897] distutils test errors when CXX is not set

[Tal Einat]

Tal Einat <taleinat at gmail.com> added the comment:

`not cmd` will but true if cmd is None, so it is completely equivalent to `cmd is None or not cmd`.  This is a purely stylistic change which doesn't alter the logic.

To get a clear understanding of what's going on, I recommend reading the short "Truth Value Testing" section in the docs:
https://docs.python.org/library/stdtypes.html#truth-value-testing

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