AreaChart:With nulls in Y

Build 996 on 2131-clean-up-stories-to-fully-enable-chromatic
1200px
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Baseline History
Build 996a35ebc4 current baseline
Current build. Accepted by Zach Stence.
Build 846340486c
Accepted by Zach Stence.
Commenting is disabled because there's a newer build on this branch