[fixed] maybeScrollItemIntoView exception when itemNode is not found

[faviktor92]

No description provided.

[CMTegner]

It's difficult to know why you want to perform this change, since you've provided no context, but I'm assuming it's because you've implemented a renderMenu function which doesn't always return every item to be rendered. This edge case is already documented:

Ensure the returned tree includes every entry in items or else the highlight order and keyboard navigation logic will break.