fixed #983 -- don't crash in HackyAI if we can't find a target.

OpenRA.Mods.RA/HackyAI.cs

@@ -283,7 +283,6 @@ namespace OpenRA.Mods.RA
 					attackTarget = ChooseEnemyTarget();
 					if (attackTarget == null)
 						return;
-				}
 
 					foreach (var a in unitsHangingAroundTheBase)
 						if (TryToMove(a, attackTarget.Value, true))
@@ -291,6 +290,7 @@ namespace OpenRA.Mods.RA
 
 					unitsHangingAroundTheBase.Clear();
 				}
+			}
 
 			// If we have any attackers, let them scan for enemy units and stop and regroup if they spot any
 			if (attackForce.Count > 0)