Comment 18 for bug 372632

I think I hit the same issue (described above by David) in Zwiki. Before 2.12, if a standard_error_message object in a folder rendered nothing, zope would invoke the one in the next folder up. In 2.12.0 it just stops, I had to explicitly re-raise it
(<dtml-else><dtml-with container><dtml-var standard_error_message></dtml-with> seems to work).

The new behaviour seems fine, but probably needs to be added to the release notes.