Fix Internal Error on empty tabcomplete

src/de/warking/bungeecore/PlayerListener.java

@@ -165,7 +165,7 @@ public class PlayerListener implements Listener {
                     ProxiedPlayer sender = (ProxiedPlayer) e.getSender();
                     sender.sendMessage(BungeeCore.ChatPrefix + "§cUnbekannter Befehl.");
                 }
-            }else if(command[0].equals("/bau") && e.getSender() instanceof ProxiedPlayer){
+            }else if(command[0].equalsIgnoreCase("/bau") && e.getSender() instanceof ProxiedPlayer){
                 ProxiedPlayer sender = (ProxiedPlayer) e.getSender();
                 if(!sender.getServer().getInfo().getName().equals("Bauserver")){
                     e.setCancelled(true);

src/de/warking/bungeecore/commands/JoinmeCommand.java

@@ -12,6 +12,8 @@ import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.config.ServerInfo;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 
+import java.util.ArrayList;
+
 public class JoinmeCommand extends Command {
 
     public JoinmeCommand() {
@@ -59,6 +61,6 @@ public class JoinmeCommand extends Command {
         if(args.length == 1){
             return allPlayers(args[0]);
         }
-        return null;
+        return new ArrayList<>();
     }
 }

src/de/warking/bungeecore/commands/KickCommand.java

@@ -5,6 +5,8 @@ import net.md_5.bungee.api.CommandSender;
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 
+import java.util.ArrayList;
+
 public class KickCommand extends Command {
 
     public KickCommand() {
@@ -42,6 +44,6 @@ public class KickCommand extends Command {
         if(args.length == 1){
             return allPlayers(args[0]);
         }
-        return null;
+        return new ArrayList<>();
     }
 }

src/de/warking/bungeecore/commands/MsgCommand.java

@@ -5,6 +5,7 @@ import net.md_5.bungee.api.CommandSender;
 import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 
 public class MsgCommand extends Command {
@@ -57,6 +58,6 @@ public class MsgCommand extends Command {
         if(args.length == 1){
             return allPlayers(args[0]);
         }
-        return null;
+        return new ArrayList<>();
     }
 }