BUG: Ensure that the index values obtained when calling describe on a…

…n empty Categorical / Object column is the same as that of an non empty column

pandas/tests/frame/test_analytics.py

@@ -588,6 +588,8 @@ def test_describe_categorical(self):
         result = df3.describe()
         tm.assert_numpy_array_equal(result["cat"].values, result["s"].values)
 
+    def test_describe_empty_categorical_column(self):
+        # GH 26397
         # Ensure the index of an an empty categoric DataFrame column
         # also contains (count, unique, top, freq)
         df = pd.DataFrame({"empty_col": Categorical([])})