Backport PR #20965 on branch v3.5.x (BUG: Fix f_back is None handling)#20967

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dstansby merged 1 commit intomatplotlib:v3.5.xfrom

meeseeksmachine:auto-backport-of-pr-20965-on-v3.5.x

Sep 1, 2021

Commits on Sep 1, 2021

Backport PR #20965: BUG: Fix f_back is None handling

QuLogic
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