Someone'll buy bitcoin before it's reached $0, so i think it's impossible
But, if bitcoin price crashed $0, most likely internet is dead too, which means world is in chaous
Well as far as i know you can't make an order with $0 value.
At least in Yobit i get an error which i think that it is same also in other exchanges.
Error Total transaction amount is less than minimal total: 0.00010000