A channel in black is the worst thing that can happen. AURA carries several defences, and none of them needs anybody in the room.
If a file is missing
The engine skips it and carries on. It does not stop to ask. It is noted in the log and pre-flight had warned about it beforehand.
If the rundown runs out
The emergency loop takes over: content you choose, repeating until there is programming again. Better a test card or a promo on a loop than nothing.
If a reserved hole arrives empty
Automation leaves holes when it cannot find anything to put there. If the hour arrives and it is still empty, it loops the assigned filler.
If the card stops responding
AURA watches that the card keeps delivering frames. If more than three seconds pass without a sign of life, it detects it and warns.
If the stream drops
It retries by itself, with increasing back-off, until it comes back.
Continuous monitoring
Every minute the state of the channels is written to the log: frames delivered, missed, health and audio-video drift. If something degrades slowly, there is a trail to find it afterwards.