PHP 8 typed method_exists breaks missing nested relation hydration

[nickfls]

PHP Version: 8.0
Laravel Framework 8.76.1
laravelcollective/html: v6.2.1

Issue location: \Collective\Html\Eloquent\FormAccessible:52

When Form class encounters a value from a missing relation, it correctly returns false for isNestedModel .

However, Laravel places the name of [missing] relation into subject's relations array with null value.
When the second value from the missing nested model is looked up isNestedModel now returns true (correctly) and as a result, null fetched with getRelation() is passed to method_exists on line 52 forcing PHP 8.0 to throw

TypeError
method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given`

[Healyhatman]

Bumping this because if this package is not abandoned I'd love an update.

To replicate:

Say you have a model DexClient with a relation 'client', and you open the form for a DexClient that doesn't have an attached client.

{{ Form::model($dexClient, [...]) }}

{{ Form::select('client', ...) }}

on PHP 8 that's all you need to throw an exception.

[themuddfamily]

I have pushed a fix for this on my fork of this project: https://github.com/LaravelLux/html