Test added to check for empty Series

Author: Akshatt

pandas/tests/reductions/test_reductions.py

@@ -688,6 +688,12 @@ def test_ops_consistency_on_empty(self, method):
         result = getattr(Series(dtype=float), method)()
         assert pd.isna(result)
 
+        # Empty Mean
+        if method == "mean":
+            s = Series([], dtype=float)
+            result = getattr(s, method)()
+            assert np.isnan(result)
+
         # timedelta64[ns]
         tdser = Series([], dtype="m8[ns]")
         if method == "var":