Fix of NullPointerException

SchematicSystem_Main/src/de/steamwar/schematicsystem/commands/SchematicCommand.java

@@ -322,7 +322,7 @@ public class SchematicCommand implements CommandExecutor {
         }
 
         SteamwarUser warkingUser = SteamwarUser.get(args[2]);
-        if(warkingUser.getUUID() == null){
+        if(warkingUser == null){
             player.sendMessage(SchematicSystem.PREFIX + "§cDieser Spieler existiert nicht");
             return;
         }