Allow parent_uid to be None. This sometimes happens at the bootstrap time.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2925 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Catalog/sql/erp5_mysql/z_update_object.zsql

@@ -53,7 +53,7 @@ UPDATE catalog SET uid=<dtml-sqlvar uid type="int">,
   security_uid=<dtml-sqlvar security_uid type="int">,
   path=<dtml-sqlvar getPath type="string">,
   relative_url=<dtml-sqlvar getRelativeUrl type="string">,
-  parent_uid=<dtml-sqlvar getParentUid type="int">,
+  parent_uid=<dtml-sqlvar getParentUid type="int" optional>,
   id=<dtml-sqlvar id type="string" optional>,
   CreationDate=<dtml-sqlvar CreationDate type="string" optional>,
   description=<dtml-sqlvar getDescription type="string" optional>,