added whatsnew entry

SaturnFromTitan · SaturnFromTitan · commit 93797f480e1e · 2020-03-15T23:05:28.000+01:00
diff --git a/doc/source/whatsnew/v1.1.0.rst b/doc/source/whatsnew/v1.1.0.rst
@@ -231,6 +231,7 @@ Performance improvements
 Bug fixes
 ~~~~~~~~~
 
+- Calling :meth:`fillna` on an empty Series now correctly returns a shallow copied object. The behaviour is now consistent with :class:`Index`, :class:`DataFrame` and a non-empty :class:`Series` (:issue:`32543`).
 
 Categorical
 ^^^^^^^^^^^
