Fix issue with default getContainerItemStack

patches/common/net/minecraft/src/Item.java.patch

@@ -29,7 +29,7 @@
          Vec3 var23 = var13.addVector((double)var18 * var21, (double)var17 * var21, (double)var20 * var21);
          return par1World.rayTraceBlocks_do_do(var13, var23, par3, !par3);
      }
-@@ -650,4 +657,185 @@
+@@ -650,4 +657,189 @@
      {
          StatList.initStats();
      }
@@ -212,6 +212,10 @@
 +     */
 +    public ItemStack getContainerItemStack(ItemStack itemStack)
 +    {
++        if (!hasContainerItem())
++        {
++            return null;
++        }
 +        return new ItemStack(getContainerItem());
 +    }
  }