Fix ArmorStand Item serialization

Broken in 09182f737d

Spigot-Server-Patches/0269-Add-ArmorStand-Item-Meta.patch

@@ -1,4 +1,4 @@
-From 67cd6fe88d1ff2f141e122db653a648877c14bbb Mon Sep 17 00:00:00 2001
+From 9cdf562f0b0ffc59c5855b61250ef35de620f0d3 Mon Sep 17 00:00:00 2001
 From: Zach Brown <zach.brown@destroystokyo.com>
 Date: Sat, 27 Jan 2018 17:04:14 -0500
 Subject: [PATCH] Add ArmorStand Item Meta
@@ -350,10 +350,18 @@ index 000000000..dc372f6db
 +    }
 +}
 diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
-index 0cdc8007a..990d1e619 100644
+index 0cdc8007a..2ab4a1cf4 100644
 --- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
 +++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
-@@ -1034,7 +1034,15 @@ class CraftMetaItem implements ItemMeta, Repairable {
+@@ -129,6 +129,7 @@ class CraftMetaItem implements ItemMeta, Repairable {
+                     .put(CraftMetaFirework.class, "FIREWORK")
+                     .put(CraftMetaCharge.class, "FIREWORK_EFFECT")
+                     .put(CraftMetaKnowledgeBook.class, "KNOWLEDGE_BOOK")
++                    .put(CraftMetaArmorStand.class, "ARMOR_STAND")
+                     .put(CraftMetaItem.class, "UNSPECIFIC")
+                     .build();
+ 
+@@ -1034,7 +1035,15 @@ class CraftMetaItem implements ItemMeta, Repairable {
                          CraftMetaEnchantedBook.STORED_ENCHANTMENTS.NBT,
                          CraftMetaCharge.EXPLOSION.NBT,
                          CraftMetaBlockState.BLOCK_ENTITY_TAG.NBT,