Fix issues in 'intervention' mission

* Fix an InvalidOperationException due to querying traits on a dead
  actor (fixes #5530)
* remove a gap in the SAM belt that shouldn't be there

mods/ra/maps/intervention/map.yaml

@@ -2261,6 +2261,8 @@ Rules:
 	SAM:
 		Building:
 			Power: -5
+		RevealsShroud:
+			Range: 7c0
 	TSLA:
 		Building:
 			Power: -50
@@ -2328,6 +2330,8 @@ Sequences:
 VoxelSequences:
 
 Weapons:
+	Nike:
+		Range: 9c0
 	Maverick:
 		Warhead:
 			Damage: 175

mods/ra/maps/intervention/mission.lua

@@ -192,8 +192,10 @@ SetupWorld = function()
 	Utils.Do(SovietHarvesters, function(harvester)
 		Actor.OnDamaged(harvester, function(h)
 			Team.Do(harvesterGuard, function(g)
-				Actor.Stop(g)
-				Actor.AttackMove(g, h.Location, 3)
+				if not Actor.IsDead(g) then
+					Actor.Stop(g)
+					Actor.AttackMove(g, h.Location, 3)
+				end
 			end)
 		end)
 	end)