Fixed NullPointerException for returing to world

Fixed a bug where the game crashes when you pressed Z without spwaning a dummy NPC

Author: redomar

src/com/redomar/game/Game.java

@@ -314,7 +314,10 @@ public void render() {
 				setMap(2);
 			} else if (getMap() == 2) {
 				setMap("/levels/custom_level.png");
-				getLevel().removeEntity(getDummy()); setNpc(false);
+				if(getDummy()!=null){
+					getLevel().removeEntity(getDummy());
+					setNpc(false);
+				}
 				getLevel().addEntity(getVendor());
 				setMap(1);
 			}