v0.6.5b: added a variety of safety checks

SPD-classes/src/main/java/com/watabou/noosa/audio/Music.java

@@ -99,8 +99,12 @@ public enum Music {
 	
 	public void stop() {
 		if (player != null) {
+			try {
 				player.stop();
 				player.release();
+			} catch ( Exception e ){
+				Game.reportException(e);
+			}
 			player = null;
 		}
 	}

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/items/weapon/missiles/darts/ShockingDart.java

@@ -42,10 +42,12 @@ public class ShockingDart extends TippedDart {
 		defender.damage(Random.NormalIntRange(8, 12), this);
 		
 		CharSprite s = defender.sprite;
+		if (s != null && s.parent != null) {
 			ArrayList<Lightning.Arc> arcs = new ArrayList<>();
 			arcs.add(new Lightning.Arc(new PointF(s.x, s.y + s.height / 2), new PointF(s.x + s.width, s.y + s.height / 2)));
 			arcs.add(new Lightning.Arc(new PointF(s.x + s.width / 2, s.y), new PointF(s.x + s.width / 2, s.y + s.height)));
-		defender.sprite.parent.add( new Lightning( arcs, null ) );
+			s.parent.add(new Lightning(arcs, null));
+		}
 		
 		return super.proc(attacker, defender, damage);
 	}

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/levels/RegularLevel.java

@@ -273,10 +273,15 @@ public abstract class RegularLevel extends Level {
 	@Override
 	public int randomDestination() {
 		
+		int count = 0;
 		int cell = -1;
 		
 		while (true) {
 			
+			if (++count > 30) {
+				return -1;
+			}
+			
 			Room room = Random.element( rooms );
 			if (room == null) {
 				continue;

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/scenes/GameScene.java

@@ -159,6 +159,11 @@ public class GameScene extends PixelScene {
 	@Override
 	public void create() {
 		
+		if (Dungeon.hero == null){
+			ShatteredPixelDungeon.switchNoFade(TitleScene.class);
+			return;
+		}
+		
 		Music.INSTANCE.play( Assets.TUNE, true );
 
 		SPDSettings.lastClass(Dungeon.hero.heroClass.ordinal());

core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/windows/WndRanking.java

@@ -91,7 +91,11 @@ public class WndRanking extends WndTabbed {
 			thread = null;
 			if (error == null) {
 				remove( busy );
+				if (Dungeon.hero != null) {
 					createControls();
+				} else {
+					hide();
+				}
 			} else {
 				hide();
 				Game.scene().add( new WndError( error ) );