checks if a player is OP before opping them

response to
https://github.com/AtlasMediaGroup/TotalFreedomMod/pull/1/files/338fc81b7f1874a79265ec46b6f308a6523f656d#r533706741

src/main/java/me/totalfreedom/totalfreedommod/command/Command_opall.java

@@ -17,10 +17,13 @@ public class Command_opall extends FreedomCommand
         FUtil.staffAction(sender.getName(), "Opping all players on the server", false);
 
         for (Player player : server.getOnlinePlayers())
+        {
+            if (player.isOp())
             {
                 player.setOp(true);
                 player.sendMessage(FreedomCommand.YOU_ARE_OP);
             }
+        }
 
         return true;
     }