Catch numpy warning

Author: TomAugspurger

pandas/core/frame.py

@@ -4908,7 +4908,8 @@ def _combine_match_index(self, other, func, level=None):
             return ops.dispatch_to_series(left, right, func)
         else:
             # fastpath --> operate directly on values
-            new_data = func(left.values.T, right.values).T
+            with np.errstate(all="ignore"):
+                new_data = func(left.values.T, right.values).T
             return self._constructor(new_data,
                                      index=left.index, columns=self.columns,
                                      copy=False)