It was broken by the second migration (aq_dynamic -> erp5.portal_type).

And now the migration is not triggered by aq_dynamic, there is no reason anymore
to abort the transaction in OldTypesTool._migrateTypesTool if anything fails.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@45288 20353a03-c40f-0410-a6d1-a30d3c3de9de