AMQP consumer needs better error messages/handling

[reidsunderland]

2025-03-21 14:36:39,146 [INFO] sarracenia.moth.amqpconsumer getSetup registered consumer with tag amq.ctag-JPVd8Za4mTSLWzXAAMK2CA
2025-03-21 14:36:39,146 [WARNING] sarracenia.moth.amqpconsumer getNewMessage failed q_feeder.sarra.fdsa: 'NoneType' object has no attribute 'drain_events'

It doesn't cause a crash but we shouldn't attempt to call drain_events when self.connection is none:

sarracenia/sarracenia/moth/amqpconsumer.py

Lines 94 to 99 in 10b8c90

	if not self.connection:
	self.getSetup()
	# trigger incoming event processing
	try:
	self.connection.drain_events(timeout=0.1) # TODO configurable timeout?

I think previously getSetup would block while it slept and retried, but that has been changed. I need to check if getSetup failed.