add rub_service class to forms that are not in any category

extra/modules/root.ptl

@@ -819,6 +819,7 @@ class AlternateRootDirectory(OldRootDirectory):
             pass
         else:
             if formdef.category_id is None:
+                get_response().filter['bigdiv'] = 'rub_service'
                 return FormsRootDirectory()._q_lookup(component)
             # if there is category, let it fall back to raise TraversalError,
             # it will get caught in _q_traverse that will redirect it to an