As of MC1.11, ItemStack.EMPTY should always be used instead of 'null'.
This specifically fixes an interaction problem with the Item Scroller mod, where rolling the mouse wheel over a container slot in the wiki crashes the client.
Longer term I'd recommend going through any methods which take or return an ItemStack and annotating those parameters & returns with @Nonnull, but this PR will fix any immediate problems.
As of MC1.11, ItemStack.EMPTY should always be used instead of 'null'.
This specifically fixes an interaction problem with the Item Scroller mod, where rolling the mouse wheel over a container slot in the wiki crashes the client.
Longer term I'd recommend going through any methods which take or return an ItemStack and annotating those parameters & returns with
@Nonnull, but this PR will fix any immediate problems.