check if sender is a player in paper dumpitem command, closes #5858

patches/server/0470-Paper-dumpitem-command.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] Paper dumpitem command
 Let's you quickly view the item in your hands NBT data
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
-index de45163023f436d386e90e6ded5e6105ba3ecf35..8fdfcf001cf2ed6184d86ee033ede08fdf9aa5d6 100644
+index de45163023f436d386e90e6ded5e6105ba3ecf35..160f3cdee21d8a3aa2ed726a7fbfce460dff26f3 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperCommand.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
 @@ -20,6 +20,7 @@ import net.minecraft.server.level.ServerPlayer;
@@ -46,11 +46,15 @@ index de45163023f436d386e90e6ded5e6105ba3ecf35..8fdfcf001cf2ed6184d86ee033ede08f
              case "debug":
                  doDebug(sender, args);
                  break;
-@@ -466,6 +472,19 @@ public class PaperCommand extends Command {
+@@ -466,6 +472,23 @@ public class PaperCommand extends Command {
  
          Command.broadcastCommandMessage(sender, ChatColor.GREEN + "Paper config reload complete.");
      }
 +    private void doDumpItem(CommandSender sender) {
++        if (!(sender instanceof Player)) {
++            sender.sendMessage("Only players can use this command");
++            return;
++        }
 +        ItemStack itemInHand = ((CraftPlayer) sender).getItemInHand();
 +        net.minecraft.world.item.ItemStack itemStack = CraftItemStack.asNMSCopy(itemInHand);
 +        net.minecraft.nbt.CompoundTag tag = itemStack.getTag();