Fill in whatsnew entry, add comments with issue number

MarcoGorelli · MarcoGorelli · commit 00386b068240 · 2019-08-21T20:31:46.000+01:00
diff --git a/doc/source/whatsnew/v0.25.1.rst b/doc/source/whatsnew/v0.25.1.rst
@@ -120,6 +120,8 @@ Groupby/resample/rolling
 - Bug in :meth:`pandas.core.groupby.DataFrameGroupBy.transform` where applying a timezone conversion lambda function would drop timezone information (:issue:`27496`)
 - Bug in windowing over read-only arrays (:issue:`27766`)
 - Fixed segfault in `pandas.core.groupby.DataFrameGroupBy.quantile` when an invalid quantile was passed (:issue:`27470`)
+- Bug in :meth:`pandas.core.groupby.SeriesGroupBy.nunique` where ``NaT`` values were interfering
+with the count of unique values
 -
 
 Reshaping

Original file line number	Diff line number	Diff line change
`@@ -120,6 +120,8 @@ Groupby/resample/rolling`
`120`	`120`	- Bug in :meth:`pandas.core.groupby.DataFrameGroupBy.transform` where applying a timezone conversion lambda function would drop timezone information (:issue:`27496`)
`121`	`121`	- Bug in windowing over read-only arrays (:issue:`27766`)
`122`	`122`	- Fixed segfault in `pandas.core.groupby.DataFrameGroupBy.quantile` when an invalid quantile was passed (:issue:`27470`)
	`123`	+- Bug in :meth:`pandas.core.groupby.SeriesGroupBy.nunique` where ``NaT`` values were interfering
	`124`	`+with the count of unique values`
`123`	`125`	`-`
`124`	`126`
`125`	`127`	`Reshaping`