Merge pull request #10740 from reaperrr/fix-missile-nre

Fix Missile projectile crashing with NRE if it has no Image

OpenRA.Mods.Common/Effects/Missile.cs

@@ -841,6 +841,9 @@ namespace OpenRA.Mods.Common.Effects
 			if (info.ContrailLength > 0)
 				yield return contrail;
 
+			if (anim == null)
+				yield break;
+
 			var world = args.SourceActor.World;
 			if (!world.FogObscures(pos))
 			{