Raise error or log when signal is not sent because it's missing critical information

[rreinhardt9]

We have a guard clause in the transmission class that prevents a signal from being transmitted if it's missing critical information

demux/app/models/demux/transmission.rb

Lines 36 to 37 in a25d874

	def transmit
	return self unless attributes_required_to_transmit_present?

Several times now I've been confused when debugging why a signal didn't send, just to realize again that it's silently not being sent because it wasn't valid.

I think we could help users out (and future us lol) by making it more apparent when you are in this situation. If this is happening, you intended for a signal to be sent and have defined it and there are apps that are listening for this signal. I think that it would qualify as an exceptional situation because of that and not a normal failure state, especially since it means there was probably a mistake in how the signal was defined or call since it's missing critical information.

Let's look into raising a demux specific exception when this guard clause is activated.