add forgotten optional argument

Author: mantepse

src/sage/rings/polynomial/polynomial_element_generic.py

@@ -128,7 +128,7 @@ def __init__(self, parent, x=None, check=True, is_gen=False, construct=False):
         if check:
             self.__normalize()
 
-    def monomial_coefficients(self):
+    def monomial_coefficients(self, copy=None):
         """
         Return a new copy of the dict of the underlying
         elements of ``self``.