Minor Can add server to datacenter even if there isn't enough rackspace left

[ReMind]

The game just let me buy a 4U server in a datacenter with 3U capacity left. Everything seems to be working properly and now it won't let me add any more servers saying that the datacenter is full. The datacenter says that the current capacity is -1.

@edit: I now fixed the "bug abuse" so I'm not using more capacity than what I'm supposed to, the capacity left is now 0.