Add whatsnew entry for PR #22710

Author: pganssle

doc/source/whatsnew/v0.24.0.txt

@@ -616,6 +616,7 @@ Categorical
 ^^^^^^^^^^^
 
 - Bug in :meth:`Categorical.from_codes` where ``NaN`` values in ``codes`` were silently converted to ``0`` (:issue:`21767`). In the future this will raise a ``ValueError``. Also changes the behavior of ``.from_codes([1.1, 2.0])``.
+- Constructing a :class:`pd.CategoricalIndex` with empty values and boolean categories was raising a ``ValueError`` after a change to dtype coercion (:issue:`22702`).
 
 Datetimelike
 ^^^^^^^^^^^^