Allies02 crashes in the first minutes:

```
Exception of type `System.InvalidOperationException`: Sequence contains no matching element
  at System.Linq.Enumerable.Max[Armament] (IEnumerable`1 source, System.Func`2 selector) [0x0005b] in /home/abuild/rpmbuild/BUILD/mono-3.2.3/mcs/class/System.Core/System.Linq/Enumerable.cs:1592 
  at OpenRA.Mods.RA.AttackBase.GetMaximumRange () [0x00029] in /home/matthias/Projekte/OpenRA/OpenRA.Mods.RA/Attack/AttackBase.cs:148 
  at OpenRA.Mods.RA.AttackBomber.Tick (OpenRA.Actor self) [0x00015] in /home/matthias/Projekte/OpenRA/OpenRA.Mods.RA/AttackBomber.cs:36 
  at OpenRA.World.<Tick>m__D1 (TraitPair`1 x) [0x0000e] in /home/matthias/Projekte/OpenRA/OpenRA.Game/World.cs:212 
  at (wrapper delegate-invoke) System.Action`1<OpenRA.TraitPair`1<OpenRA.Traits.ITick>>:invoke_void__this___T (OpenRA.TraitPair`1<OpenRA.Traits.ITick>)
  at OpenRA.WorldUtils+<DoTimed>c__AnonStorey36`1[OpenRA.TraitPair`1[OpenRA.Traits.ITick]].<>m__80 (TraitPair`1 x) [0x00014] in /home/matthias/Projekte/OpenRA/OpenRA.Game/WorldUtils.cs:176 
  at OpenRA.Exts.Do[TraitPair`1] (IEnumerable`1 e, System.Action`1 fn) [0x00017] in /home/matthias/Projekte/OpenRA/OpenRA.FileFormats/Exts.cs:36 
  at OpenRA.WorldUtils.DoTimed[TraitPair`1] (IEnumerable`1 e, System.Action`1 a, System.String text, Double time) [0x00034] in /home/matthias/Projekte/OpenRA/OpenRA.Game/WorldUtils.cs:173 
  at OpenRA.World.Tick () [0x0013b] in /home/matthias/Projekte/OpenRA/OpenRA.Game/World.cs:212 
  at OpenRA.Game.TickInner (OpenRA.Network.OrderManager orderManager) [0x00135] in /home/matthias/Projekte/OpenRA/OpenRA.Game/Game.cs:201 
  at OpenRA.Game.Tick (OpenRA.Network.OrderManager orderManager) [0x00034] in /home/matthias/Projekte/OpenRA/OpenRA.Game/Game.cs:127 
  at OpenRA.Game.Run () [0x0002d] in /home/matthias/Projekte/OpenRA/OpenRA.Game/Game.cs:407 
  at OpenRA.Program.Run (System.String[] args) [0x00011] in /home/matthias/Projekte/OpenRA/OpenRA.Game/Support/Program.cs:109 
  at OpenRA.Program.Main (System.String[] args) [0x0005a] in /home/matthias/Projekte/OpenRA/OpenRA.Game/Support/Program.cs:38
```