If you had the fridge controls set on AUTO, then it should have switched to lp gas when the power went out. You did have it on AUTO mode right?
Good point...
You would also have had to have the valve open on the propane tank...
Same thing happened to me while staging for a trip, but I was prepared for it.
Use Clorox cleanup in a spray bottle and leave the doors open. Most now have a storage position lock - little grey tab on each door that you push out that keeps the door cracked open, but still secured. Me? - I just leave them open while stored.