Backport PR #17720 on branch v3.3.x (Fix check for manager = None.)#17724

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QuLogic merged 1 commit intomatplotlib:v3.3.xfrom

meeseeksmachine:auto-backport-of-pr-17720-on-v3.3.x

Jun 22, 2020

Commits on Jun 22, 2020

Backport PR #17720: Fix check for manager = None.

QuLogic
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meeseeksmachine
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