Merge pull request #1030 from goweiwen/fix-multifloor-dungeon-npe

Properly initialize dungeon in DGame constructor

core/src/main/java/de/erethon/dungeonsxl/dungeon/DGame.java

@@ -64,7 +64,8 @@ public class DGame implements Game {
         this.plugin = plugin;
         plugin.getGameCache().add(this);
 
-        this.dungeon = dungeon;
+        setDungeon(dungeon);
+
         if (this.dungeon == null) {
             throw new IllegalStateException("Game initialized without dungeon");
         }