Backport PR #16613 on branch v3.2.x (Fix edge-case in preprocess_data, if label_namer is optional and unset.)#16622

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timhoffm merged 1 commit intomatplotlib:v3.2.xfrom

meeseeksmachine:auto-backport-of-pr-16613-on-v3.2.x

Mar 1, 2020

Commits on Mar 1, 2020

Backport PR #16613: Fix edge-case in preprocess_data, if label_namer is optional and unset.

timhoffm
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