Not all print services may be capable of delivering interesting
events, or even telling when a job is complete. This message indicates
the print job has no further information or communication
with the print service. This message should always be delivered
if a terminal event (completed/failed/canceled) is not delivered.
For example, if messages such as JOB_COMPLETE have NOT been received
before receiving this message, the only inference that should be drawn
is that the print service does not support delivering such an event.