I need triggers for Hero Siege

Hi all!
Well, im making a hero siege map. And the problem is this:
It is for 10 players. But lets say, 10 people didnt join the game. So i would like to have a trigger who does this:
If there are (lets say 8 players) There would be 2 open slots where creeps would have spawned were there was no player. Well, the 8 other defend their place, but it would still be 2 open slots where creep attacks.

So i want to fix it so that if there are only (lets say 8 again) 8 players, then i dont want creeps to spawn at the open slots where there are no players defending. Anyone know how i can do this? :(
That would be very helpful! (I hope you understand what i mean) ;)

For your spawn triggers make an If/Then/Else for every lane and slap this condition in there for the player who has to guard that lane.

Aha, thank you very much! ^_^ *opens world editor*
wow, was suprised how short time it took to get a reply on this site! :D