Fix MsgCommand being able to /r to offline players

VelocityCore/src/de/steamwar/velocitycore/commands/MsgCommand.java

@@ -20,6 +20,8 @@
 package de.steamwar.velocitycore.commands;
 
 import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.proxy.Velocity;
+import de.steamwar.velocitycore.VelocityCore;
 import de.steamwar.velocitycore.listeners.ChatListener;
 import de.steamwar.command.SWCommand;
 import de.steamwar.messages.Chatter;
@@ -41,7 +43,7 @@ public class MsgCommand extends SWCommand {
     }
 
     public static void msg(PlayerChatter sender, Player target, String[] args) {
-        if(target == null || target.getCurrentServer().isEmpty()) {
+        if(target == null || VelocityCore.getProxy().getPlayer(target.getUniqueId()).orElse(null) == null) {
             sender.system("MSG_OFFLINE");
             return;
         }