mod_default_bookmarks: Abort on incompatible mod_bookmarks The module formerly known as mod_bookmarks exposed this publish_to_pep function, while the new mod_bookmarks2 (called mod_bookmarks in trunk) does not.

This module discards typing notifications sent to a bare host JID,
preventing error replies to be sent. These errors are harmless but can
be annoying sometimes if your client shows them prominently.