Fixing NPE on disconnect

SpigotCore_Main/src/de/steamwar/scoreboard/SWScoreboard.java

@@ -45,6 +45,7 @@ public class SWScoreboard {
         if(!playerBoards.containsKey(player))
             return;
 
+        try{
             switch (Core.getVersion()) {
                 case 8:
                     ((SWScoreboard_8) playerBoards.get(player)).deleteScoreboard(player);
@@ -65,6 +66,9 @@ public class SWScoreboard {
                     ((SWScoreboard_15) playerBoards.get(player)).deleteScoreboard(player);
                     break;
             }
+        }catch(NullPointerException e){
+            //ignored
+        }
         playerBoards.remove(player);
     }