check value not none at uninstall of business template

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4961 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -1405,7 +1405,9 @@ class CatalogMethodTemplateItem(ObjectTemplateItem):
       else:
         values = self._archive.values()
     else:
-      values.append(self._archive[object_path])
+      value = self._archive[object_path]
+      if value is not None:
+        values.append(value)
     # Make copies of attributes of the default catalog of portal_catalog.
     sql_catalog_object_list = list(catalog.sql_catalog_object_list)
     sql_uncatalog_object = list(catalog.sql_uncatalog_object)