fix missing variable at uninstall of portal types properties

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4938 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -1162,6 +1162,7 @@ class PortalTypeAllowedContentTypeTemplateItem(BaseTemplateItem):
 
   def uninstall(self, context, **kw):
     object_path = kw.get('object_path', None)
+    pt = p.unrestrictedTraverse('portal_types')
     if object_path is not None:
       object_keys = [object_path]
     else: