Quick fixes.

- Fixed a crash when closing the application in the ranking screen when viewing a score.
- Fixed a minor bug where OsuGroupList fields were not being erased upon restart.
- Dim the track volume by 50% when viewing a score.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/states/GameRanking.java

@@ -171,7 +171,10 @@ public class GameRanking extends BasicGameState {
 			throws SlickException {
 		Display.setTitle(game.getTitle());
 		Utils.getBackButton().setScale(1f);
-		if (data.isGameplay())
+		if (!data.isGameplay()) {
+			if (!MusicController.isTrackDimmed())
+				MusicController.toggleTrackDimmed(0.5f);
+		} else
 			SoundController.playSound(SoundEffect.APPLAUSE);
 	}
 
@@ -199,7 +202,10 @@ public class GameRanking extends BasicGameState {
 	 * Sets the associated GameData object.
 	 * @param data the GameData
 	 */
-	public void setGameData(GameData data) {
-		this.data = data;
-	}
+	public void setGameData(GameData data) { this.data = data; }
+
+	/**
+	 * Returns the current GameData object (usually null unless state active).
+	 */
+	public GameData getGameData() { return data; }
 }

src/itdelatrisu/opsu/states/MainMenu.java

@@ -249,7 +249,7 @@ public class MainMenu extends BasicGameState {
 		// window focus change: increase/decrease theme song volume
 		if (MusicController.isThemePlaying() &&
 		    MusicController.isTrackDimmed() == container.hasFocus())
-				MusicController.toggleTrackDimmed();
+				MusicController.toggleTrackDimmed(0.33f);
 
 		// fade in background
 		if (bgAlpha < 0.9f) {

src/itdelatrisu/opsu/states/SongMenu.java

@@ -777,6 +777,10 @@ public class SongMenu extends BasicGameState {
 		else if (MusicController.isPaused())
 			MusicController.resume();
 
+		// undim track
+		if (MusicController.isTrackDimmed())
+			MusicController.toggleTrackDimmed(1f);
+
 		// reset song stack
 		randomStack = new Stack<SongNode>();