fix issues with mpspawn and waypoint sprites

OpenRA.Mods.RA/Render/RenderEditorOnly.cs

@@ -0,0 +1,28 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Render
+{
+	class RenderEditorOnlyInfo : RenderSimpleInfo
+	{
+		public override object Create(ActorInitializer init) { return new RenderEditorOnly(init.self); }
+	}
+
+	class RenderEditorOnly : RenderSimple
+	{
+		public RenderEditorOnly(Actor self) : base(self, () => 0) { }
+
+		static readonly Renderable[] Nothing = { };
+		public override IEnumerable<Renderable> Render(Actor self) { return Nothing; }
+	}
+}