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In a way, the presence of air doesn't matter. Why, because we could quite easily build a fridge that didn't hold any air.
But also... if you know that there's air there (because you've been told), and if that makes you feel that an absence of other stuff in the fridge is ok, well then I might as well say that there's an "aether" existing in the absence of a universe, a substrate on which the universe exists. Ok Ok. Not such a great example... but do you get what I'm saying?
Going back to the fridge example.... you might point out the presence of quantum "froth" or particle antiparticle pairs - even in a vacuum. In this case my reply is that a cosmologist is likely to come up with something else just as theoretical sounding that existed prior to the universe.
None of these are relevant really to the macro level issue of "is it possible for nothing to exist... I've never seen that". I'm simply saying that this (latter) question is silly - because in the everyday world we often have an 'absence' of things.
I hope that makes sense....
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