Backport PR #19583 on branch v3.4.x (FIX: check for a set during color conversion)#19615

Merged

QuLogic merged 1 commit intomatplotlib:v3.4.xfrom

meeseeksmachine:auto-backport-of-pr-19583-on-v3.4.x

Mar 2, 2021

Commits on Mar 1, 2021

Backport PR #19583: FIX: check for a set during color conversion

QuLogic
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meeseeksmachine
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