Fix deprecation warning regarding NotImplemented being evaluated in boolean context.#7435

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tirkarthi wants to merge 2 commits intoencode:masterfrom

tirkarthi:fix-not-impl-warning

Commits on Jul 29, 2020

Fix deprecation warning regarding NotImplemented being evaluated in boolean context.
tirkarthi
committed

Commits on Aug 6, 2020

Fix NotImplemented code path to return NotImplemented itself.
tirkarthi
committed