Assist: Fail move if no moves have been found

Scripts/Moves/Assist.as

@@ -20,7 +20,7 @@ namespace Gen7 {
                 }
             } 
             if (possibleMoves.length == 0){
-                // TODO: Log failure.
+                move.Fail();
                 return;
             }
             auto i = battle.Random.Get(possibleMoves.length);