Fix firework meta NPE

Fixes #10466

patches/server/General-ItemMeta-fixes.patch

@@ -0,0 +1,26 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Sat, 27 Apr 2024 20:56:17 -0700
+Subject: [PATCH] General ItemMeta fixes
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaFirework.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaFirework.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaFirework.java
++++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaFirework.java
+@@ -0,0 +0,0 @@ class CraftMetaFirework extends CraftMetaItem implements FireworkMeta {
+         }
+ 
+         List<FireworkExplosion> effects = new ArrayList<>();
+-        for (FireworkEffect effect : this.effects) {
+-            effects.add(CraftMetaFirework.getExplosion(effect));
++        // Paper start - fix NPE with effects list being null
++        if (this.effects != null) {
++            for (FireworkEffect effect : this.effects) {
++                effects.add(CraftMetaFirework.getExplosion(effect));
++            }
+         }
++        // Paper end
+ 
+         itemTag.put(CraftMetaFirework.FIREWORKS, new Fireworks(this.power, effects));
+     }