fix spy crashing things when disguised as a unit with fewer idle anims

OpenRA.Game/Graphics/Animation.cs

@@ -56,13 +56,14 @@ namespace OpenRA.Graphics
 			PlayThen( sequenceName, () => PlayRepeating( CurrentSequence.Name ) );
 		}
 
-		public void ReplaceAnim(string sequenceName)
+		public bool ReplaceAnim(string sequenceName)
 		{
 			if (!HasSequence(sequenceName))
-				return;
+				return false;
 
 			CurrentSequence = SequenceProvider.GetSequence(name, sequenceName);
 			frame %= CurrentSequence.Length;
+			return true;
 		}
 
 		public void PlayThen( string sequenceName, Action after )
@@ -124,14 +125,15 @@ namespace OpenRA.Graphics
 			}
 		}
 
-		public void ChangeImage(string newImage)
+		public void ChangeImage(string newImage, string newAnimIfMissing)
 		{
 			newImage = newImage.ToLowerInvariant();
 			
 			if (name != newImage)
 			{
 				name = newImage.ToLowerInvariant();
-				ReplaceAnim(CurrentSequence.Name);
+				if (!ReplaceAnim(CurrentSequence.Name))
+					ReplaceAnim(newAnimIfMissing);
 			}
 		}
 

OpenRA.Mods.RA/IdleAnimation.cs

@@ -8,8 +8,8 @@
  */
 #endregion
 
-using OpenRA.Traits;
 using OpenRA.Mods.RA.Render;
+using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
@@ -20,7 +20,6 @@ namespace OpenRA.Mods.RA
 		public object Create(ActorInitializer init) { return new IdleAnimation(this); }
 	}
 
-	// infantry prone behavior
 	class IdleAnimation : ITick, INotifyIdle
 	{
 		enum IdleState
@@ -54,7 +53,12 @@ namespace OpenRA.Mods.RA
 			else if (delay > 0 && --delay == 0)
 			{
 				state = IdleState.Active;
-				self.Trait<RenderInfantry>().anim.PlayThen(sequence, () => state = IdleState.None);
+				var ri = self.TraitOrDefault<RenderInfantry>();
+
+				if (ri.anim.HasSequence(sequence))
+					ri.anim.PlayThen(sequence, () => state = IdleState.None);
+				else
+					state = IdleState.None;
 			}
 		}
 		

OpenRA.Mods.RA/Render/RenderSpy.cs

@@ -46,13 +46,13 @@ namespace OpenRA.Mods.RA.Render
 				{
 					disguisedAsPlayer = target.Owner;
 					disguisedAsSprite = target.Trait<RenderSimple>().GetImage(target);
-					anim.ChangeImage(disguisedAsSprite);
+					anim.ChangeImage(disguisedAsSprite, "stand");
 				}
 				else
 				{
 					disguisedAsPlayer = null;
 					disguisedAsSprite = null;
-					anim.ChangeImage(GetImage(self));
+					anim.ChangeImage(GetImage(self), "stand");
 				}
 			}
 		}