Do not store Persistent object in Component registry cache.

(cherry picked from commit e7967448c588f4b5743dfca28d9be3ab47ba05c9)

Conflicts:
	product/ERP5Type/dynamic/component_package.py

product/ERP5Type/dynamic/component_package.py

@@ -114,7 +114,7 @@ class ComponentDynamicPackage(ModuleType):
           except AttributeError:
             # XXX: Accessors may have not been generated yet
             pass
-
+          else:
             if validation_state_tuple in ('modified', 'validated'):
               version = component.getVersion(validated_only=True)
               # The versions should have always been set on ERP5Site property