fix: correct the empty check for shulker boxes

src/main/java/carpetextra/utils/InventoryUtils.java

@@ -1,38 +1,17 @@
 package carpetextra.utils;
 
 import net.minecraft.component.DataComponentTypes;
-import net.minecraft.component.type.NbtComponent;
+import net.minecraft.component.type.ContainerComponent;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.NbtCompound;
-import net.minecraft.nbt.NbtElement;
-import net.minecraft.nbt.NbtList;
 
-public class InventoryUtils
-{
+public class InventoryUtils {
     /**
      * Checks if the given Shulker Box (or other storage item with the
      * same NBT data structure) currently contains any items.
      * @return true if the item's stored inventory has any items
      */
-    public static boolean shulkerBoxHasItems(ItemStack stackShulkerBox)
-    {
-        NbtComponent nbtComponent = stackShulkerBox.get(DataComponentTypes.BLOCK_ENTITY_DATA);
-        if (nbtComponent == null)
-            return false;
-        /* FIXME find a new way of doing this */
-        NbtCompound nbt = nbtComponent.getNbt();
-
-        if (nbt != null && nbt.contains("BlockEntityTag", NbtElement.COMPOUND_TYPE))
-        {
-            NbtCompound tag = nbt.getCompound("BlockEntityTag");
-
-            if (tag.contains("Items", NbtElement.LIST_TYPE))
-            {
-                NbtList tagList = tag.getList("Items", NbtElement.COMPOUND_TYPE);
-                return !tagList.isEmpty();
-            }
-        }
-
-        return false;
+    public static boolean shulkerBoxHasItems(ItemStack stackShulkerBox) {
+        ContainerComponent containerComponent = stackShulkerBox.get(DataComponentTypes.CONTAINER);
+        return containerComponent != null && !containerComponent.iterateNonEmpty().iterator().hasNext();
     }
 }