FS-10304: [mod_callcenter] Prevent infinite logging when a stale queue member in found in the database

Having a member from a queue that is no longer found on the current system
causes infinite logging about skipping a member.

There is already cleanup code for abandoned calls in same function, but it can
never be reached for this case, because there is no queue.

If the queue is never found again in the system, the logging would continue
forever or until the stale record gets removed from the database.

FS-10304 #resolve