Warwick's Q Interaction vs Dead Targets

Something I've noticed a lot whenever I play Warwick, his Q tends to still go off AFTER the target has died. It feels bad when you go to Q something, they die before the Q goes off, then the Q goes off on their corpse afterwards for no reason. This not only puts the Q on cooldown, but it also wastes what precious mana Warwick has without it doing anything for him at all. It's not like you're mid-animation or anything either. You press Q, Warwick moves in to use it, the target dies, Warwick gets into range, still uses Q anyways.

This interaction is very annoying and needs changed badly.