Better error log in MoveToSceneAction

Author: bladecoder

blade-engine/src/com/bladecoder/engine/actions/MoveToSceneAction.java

@@ -56,6 +56,11 @@ public boolean run(VerbRunner cb) {
 
 		BaseActor a = s.getActor(actorId, false);
 
+		if (a == null) {
+			EngineLogger.error(getClass() + "- Actor not found: " + actorId + " in scene: " + s.getId());
+			return false;
+		}
+
 		s.removeActor(a);
 
 		Scene ts = null;