never spawn parachutes outside the map

fixes #6302

OpenRA.Mods.RA/EjectOnDeath.cs

@@ -33,7 +33,7 @@ namespace OpenRA.Mods.RA
 	{
 		public void Killed(Actor self, AttackInfo e)
 		{
-			if (self.Owner.WinState == WinState.Lost)
+			if (self.Owner.WinState == WinState.Lost || !self.World.Map.Contains(self.Location))
 				return;
 
 			var r = self.World.SharedRandom.Next(1, 100);

OpenRA.Mods.RA/ParaDrop.cs

@@ -77,6 +77,9 @@ namespace OpenRA.Mods.RA
 			if (droppedAt.Contains(self.Location) || checkForSuitableCell && !IsSuitableCell(cargo.Peek(self), self.Location))
 				return;
 
+			if (!self.World.Map.Contains(self.Location))
+				return;
+
 			// unload a dude here
 			droppedAt.Add(self.Location);