Another Palmer cab merger question

I will soon have in my possession a Peavey Alphabass. It doesn’t have an 8 ohm tap, but I have two 8 ohm cabs. No problem running both with my Palmer cab merger in parallel, but if I only want to use one, can I use a dummy plug into one of the Palmer’s cab outputs? I know this works for plugging directly into most amp speaker ouputs, and I think it should probably do the same with a merger box, but I’d like to make sure if anyone has any ‘input’ to provide.