Added null check and removed unused method from Fillr

By: VictorD <victor.danell@gmail.com>

paper-api/src/main/java/org/bukkit/fillr/Fillr.java

@@ -3,7 +3,6 @@ package org.bukkit.fillr;
 import org.bukkit.*;
 import org.bukkit.plugin.*;
 import org.bukkit.plugin.java.*;
-import org.bukkit.entity.Player;
 import org.bukkit.event.*;
 
 import java.io.File;
@@ -31,8 +30,4 @@ public class Fillr extends JavaPlugin {
         listener = new FillrListener(getServer());
         getServer().getPluginManager().registerEvent(Event.Type.PLAYER_COMMAND, listener, Event.Priority.Normal, this);
     }
-
-    public void onCommand(Player player, String command, String[] args) {
-        // TODO Auto-generated method stub
-    }
 }