No. If it turns out there aren't 1,500 pounds of cherries on the truck, then some equitable way has to be found to split the damages among the parties. If the money hasn't already changed hands and the cherries are still intact, it might make sense to just void the contract. But if some of the cherries have already been consumed or the parties have taken irreversible actions relying on the contract, then the harm done by the common mistake has to be divided fairly between the parties.

That's what I'm suggesting should happen here. Both parties made the same mistake which directly led to the harm, so the harm should be divided fairly between the parties. I'm not proposing any specific division as fair, but 50/50 would be my default presumption.