Author taleinat
Recipients Michael.Felt, dstufft, eric.araujo, taleinat
Date 2018-11-02.19:39:54
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`not cmd` will be 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:
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2018-11-02 19:39:54taleinatsetrecipients: + taleinat, eric.araujo, dstufft, Michael.Felt
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