SPIGOT-2855: Empty ItemStacks in PlayerDeathEvent drops

nms-patches/EntityPlayer.patch

@@ -182,7 +182,7 @@
 +
 +        if (!keepInventory) {
 +            for (ItemStack item : this.inventory.getContents()) {
-+                if (!EnchantmentManager.c(item)) { // PAIL: shouldNotDrop (Vanishing enchant)
++                if (!item.isEmpty() && !EnchantmentManager.c(item)) { // PAIL: shouldNotDrop (Vanishing enchant)
 +                    loot.add(CraftItemStack.asCraftMirror(item));
 +                }
 +            }