[issue2503] Replace "== None/True/False" with "is"

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

You are right of course, but just out of curiosity, do you really have
objects that compare equal to None?

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nosy: +amaury.forgeotdarc

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