change error type and avoid infinite loop

Author: minggli

pandas/core/internals/blocks.py

@@ -994,13 +994,14 @@ def putmask(self, mask, new, align=True, inplace=False, axis=0,
             # for 2D cases
             if ((is_list_like(new) and np.any(mask[mask]) and
                  getattr(new, 'ndim', 1) == 1)):
-                # GH 19266 and GH 21977
                 if not (mask.shape[-1] == len(new) or
                         mask[mask].shape[-1] == len(new) or
                         len(new) == 1):
-                    raise NotImplementedError(
-                        "Replace with array-like of mismatch length to masked "
-                        "array is not supported.")
+                    # GH 19266 and GH 21977
+                    # ValueError triggers try except block in Block.replace
+                    # causing RecursionError
+                    raise Exception("cannot assign mismatch length "
+                                    "to masked array")
 
             np.putmask(new_values, mask, new)