Descriptive error message on when the dataframe is empty and margin is set

Author: show981111

pandas/core/reshape/pivot.py

@@ -1165,6 +1165,9 @@ def _normalize(
 
     elif margins is True:
         # keep index and column of pivoted table
+        if table.empty:
+            raise ValueError("Can't get margins since the result dataframe is empty ")
+
         table_index = table.index
         table_columns = table.columns
         last_ind_or_col = table.iloc[-1, :].name