upgrader: support the case where a portal type has been removed but still...

upgrader: support the case where a portal type has been removed but still referenced in workflow chains

bt5/erp5_upgrader/SkinTemplateItem/portal_skins/erp5_upgrader/TemplateTool_checkWorkflowChainConsistency.xml

@@ -97,10 +97,7 @@ new_workflow_chain_dict = {\'chain_%s\' % portal_type : \',\'.join(chain) \\\n
   for portal_type, chain in workflow_chain_by_portal_type_dict.iteritems()}\n
 \n
 for portal_type, workflow_chain in portal_type_dict.iteritems():\n
-  try:\n
-    workflow_chain_list = list(workflow_chain_by_portal_type_dict[portal_type])\n
-  except:\n
-    return workflow_chain_by_portal_type_dict[portal_type]\n
+  workflow_chain_list = list(workflow_chain_by_portal_type_dict.get(portal_type, []))\n
   expected_workflow_chain = sorted(workflow_chain)\n
   if sorted(workflow_chain_list) != expected_workflow_chain:\n
     error_list.append("%s - Expected: %s <> Found: %s" % (portal_type, \', \'.join(workflow_chain), \', \'.join(workflow_chain_list)))\n