Bug in to_datetime raising ValueError with None and NaT and more than 50 elements (pandas-dev#41006)

Author: phofl

doc/source/whatsnew/v1.3.0.rst

@@ -858,6 +858,7 @@ Reshaping
 - Bug in :meth:`DataFrame.stack` not preserving ``CategoricalDtype`` in a ``MultiIndex`` (:issue:`36991`)
 - Bug in :func:`to_datetime` raising error when input sequence contains unhashable items (:issue:`39756`)
 - Bug in :meth:`Series.explode` preserving index when ``ignore_index`` was ``True`` and values were scalars (:issue:`40487`)
+- Bug in :func:`to_datetime` raising ``ValueError`` when :class:`Series` contains ``None`` and ``NaT`` and has more than 50 elements (:issue:`39882`)
 
 Sparse
 ^^^^^^