Add view mixin to make sure a subclass can't override its

parent's get_queryset method.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/linking/views.py

@@ -133,8 +133,7 @@ class SmartLinkListView(SingleObjectListView):
         }
 
     def get_queryset(self):
-        self.queryset = self.get_smart_link_queryset()
-        return super(SmartLinkListView, self).get_queryset()
+        return self.get_smart_link_queryset()
 
     def get_smart_link_queryset(self):
         return SmartLink.objects.all()