Update role.py to fix json_out Role-bug

role couldn't be set correctly. out value wasn't used, so setting json_out value fixes problem

ml/role.py

@@ -79,7 +79,7 @@ def identifier(self, value):
     def to_json(self):
         """Returns a JSON representation of this role."""
 
-        out = {"class": self.__class_name, "name": self.__name}
+        self.__json_out = {"class": self.__class_name, "name": self.__name}
         if self.identifier:
             self.__json_out["identifier"] = self.identifier
         return self.__json_out