[GAMEPLAY] Cho'Gath's ult goes on cooldown if a target dies just before the damage is dealt

Normally, if a minion dies while the ult is being used, it won't go on cooldown and you won't get a stack, which is nice. In some certain cases and timings however, your ult will go on cooldown if the minion dies just before it is used. Furthermore, pinging your ult will tell your team that it is able to be used, but actually cannot be casted and will appear to be cooling down from the client

Steps to reproduce:

1. Wait until a minion is low enough that something breathing on it would kill it, usually your adc
2. Use your ult just before your ADC's attacks hit it so that your ult damage would occur just after the auto attack lands
3. Your ult will be on cooldown even though pinging it shows it as ready

This should work all the time as long as the timing is correct, but it can be a rather narrow window. This works on any target, not just minions

This is mostly a problem because the ult goes on cooldown even though the damage isn't dealt and no stacks are given, but also because you can't ping that your ult is on cooldown. The game thinks the ult is not on cooldown, but the client thinks it is on cooldown and can't be used. It happens frequently enough to be encountered every 5-10 games