Backport PR #38330: REGR: Groupby first/last/nth treats None as an observation#38333

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simonjayhawkins merged 1 commit intopandas-dev:1.1.xfrom

simonjayhawkins:backport-of-pr-38330-on-1.1.x

Dec 6, 2020

Commits on Dec 6, 2020

Backport PR #38330: REGR: Groupby first/last/nth treats None as an observation

rhshadrach
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simonjayhawkins
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