Crash on devide by zero by ice slime

```
ScriptWarning: RBTTIceSlime 
DM-UNO-The_Meatlocker.TheWorld:PersistentLevel.RBTTIceSlime_538 (Function 
RBTTInvasion.RBTTIceSlime:AttachIce:0125) Divide by zero

This might also occur on the fire slime
```

Original issue reported on code.google.com by `faketruth@gmail.com` on 3 Jun 2009 at 8:07
