If an enchanting table was force opened, default the world to the player's world for checks when dropping items. Fixes SPIGOT-408

nms-patches/ContainerEnchantTable.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde//net/minecraft/server/ContainerEnchantTable.java	2014-11-28 22:39:23.881313691 +0000
-+++ src/main/java/net/minecraft/server/ContainerEnchantTable.java	2014-11-28 22:38:24.125315018 +0000
+--- ../work/decompile-8eb82bde//net/minecraft/server/ContainerEnchantTable.java	Sat Jan 31 16:10:54 2015
++++ src/main/java/net/minecraft/server/ContainerEnchantTable.java	Sat Jan 31 16:10:54 2015
 @@ -3,15 +3,31 @@
  import java.util.List;
  import java.util.Random;
@@ -141,7 +141,19 @@
                      if (!entityhuman.abilities.canInstantlyBuild) {
                          itemstack1.count -= j;
                          if (itemstack1.count <= 0) {
-@@ -212,6 +278,7 @@
+@@ -199,6 +265,11 @@
+ 
+     public void b(EntityHuman entityhuman) {
+         super.b(entityhuman);
++        // CraftBukkit Start - If an enchantable was opened from a null location, set the world to the player's world, preventing a crash
++        if(this.world == null) {
++            this.world = entityhuman.getWorld();
++        }
++        // CraftBukkit end
+         if (!this.world.isStatic) {
+             for (int i = 0; i < this.enchantSlots.getSize(); ++i) {
+                 ItemStack itemstack = this.enchantSlots.splitWithoutUpdate(i);
+@@ -212,6 +283,7 @@
      }
  
      public boolean a(EntityHuman entityhuman) {
@@ -149,7 +161,7 @@
          return this.world.getType(this.position).getBlock() != Blocks.ENCHANTING_TABLE ? false : entityhuman.e((double) this.position.getX() + 0.5D, (double) this.position.getY() + 0.5D, (double) this.position.getZ() + 0.5D) <= 64.0D;
      }
  
-@@ -263,5 +330,18 @@
+@@ -263,5 +335,18 @@
          }
  
          return itemstack;