If a database is in the sync selection on DTTG, but that database does not currently have anything in its sync group, then the entire sync aborts. The message “no items to sync” pops up on the desktop. No error message at all in DTTG.
Maybe it would be better if DTTG just moved on to the next database, and then the next, until a sync group with items was found. Or, if nothing to sync, then end. What is the point of the error message and aborting the sync?