fix: Entangle inner state undefined

[danharrin]

This was causing a serious Livewire issue for us where a $wire.entangle() was being removed after an AJAX request, which then caused inner to be undefined here, which crashed Livewire completely and made all further interactions break.

To fix this, I've reached for the already-stringified innerHashLatest and ensured that it is null instead of undefined in this case. If you don't want to reuse innerHashLatest here, I can swap it back for JSON.stringify(inner ?? null).

[calebporzio]

Thanks Dan!