Add better Fail massage than standard bungee

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/listeners/TablistManager.java

@@ -18,6 +18,7 @@ import java.io.File;
 import java.io.IOException;
 import java.util.*;
 import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
 
 public class TablistManager extends BasicListener {
 
@@ -78,37 +79,41 @@ public class TablistManager extends BasicListener {
     }
 
     private synchronized void updateCustomTablist(){
-        calcHeader();
+        try{
+            calcHeader();
 
-        //Calculate server-player-map
-        playerMap.clear();
-        for(ProxiedPlayer player : ProxyServer.getInstance().getPlayers()){
-            ServerInfo server = player.getServer().getInfo();
-            String serverName = server.getName();
-            if(serverName.equals("Developer"))
-                continue;
+            //Calculate server-player-map
+            playerMap.clear();
+            for(ProxiedPlayer player : ProxyServer.getInstance().getPlayers()){
+                ServerInfo server = player.getServer().getInfo();
+                String serverName = server.getName();
+                if(serverName.equals("Developer"))
+                    continue;
 
-            Subserver subserver = Subserver.getSubserver(server);
-            List<ProxiedPlayer> players;
-            if(subserver != null && subserver.getType() == Servertype.BAUSERVER){
-                players = playerMap.getOrDefault("Bau", new ArrayList<>());
-                players.add(player);
-                playerMap.putIfAbsent("Bau", players);
-            }else{
-                players = playerMap.getOrDefault(serverName, new ArrayList<>());
-                players.add(player);
-                playerMap.putIfAbsent(serverName, players);
+                Subserver subserver = Subserver.getSubserver(server);
+                List<ProxiedPlayer> players;
+                if(subserver != null && subserver.getType() == Servertype.BAUSERVER){
+                    players = playerMap.getOrDefault("Bau", new ArrayList<>());
+                    players.add(player);
+                    playerMap.putIfAbsent("Bau", players);
+                }else{
+                    players = playerMap.getOrDefault(serverName, new ArrayList<>());
+                    players.add(player);
+                    playerMap.putIfAbsent(serverName, players);
+                }
             }
+            playerMap.forEach((server, players) -> players.sort((proxiedPlayer, t1) -> proxiedPlayer.getName().compareToIgnoreCase(t1.getName())));
+
+            //Set size
+            calculateSize();
+
+            for(Tablist tablist : tablists.values())
+                tablist.refresh();
+
+            seconds++;
+        }catch(NullPointerException e){
+            ProxyServer.getInstance().getLogger().log(Level.SEVERE, "NPE", e);
         }
-        playerMap.forEach((server, players) -> players.sort((proxiedPlayer, t1) -> proxiedPlayer.getName().compareToIgnoreCase(t1.getName())));
-
-        //Set size
-        calculateSize();
-
-        for(Tablist tablist : tablists.values())
-            tablist.refresh();
-
-        seconds++;
     }
 
     @EventHandler