Fix #4679: Unable to set customview path for relation list

[zoomyboy]

This addresses the issue that it should be possible to set a custom view path for a relation. The relation list is rendered inside of the form of the parent and generally has another "meaning" than the normal table which is rendered by default. So setting a custom view path for that relation list is probably a good option.

I set this to null by default because no path meansis's just not added to the ViewPath of the list widget:

Backend\Widgets\Lists:213

        $this->recordsPerPage = $this->getUserPreference('per_page', $this->recordsPerPage);

        if ($this->showPagination == 'auto') {
            $this->showPagination = $this->recordsPerPage && $this->recordsPerPage > 0;
        }

        if ($this->customViewPath) {
            $this->addViewPath($this->customViewPath);
        }

        $this->validateModel();
        $this->validateTree();

If the view Path is null, the list just behaves as before - meaning the config value isn't set at all.

[LukeTowers]

@zoomyboy can you also make a PR to the docs repo (octobercms/docs) documenting this?

[LukeTowers]

Fixes #4679

[zoomyboy]

octobercms/docs#409

[github-actions]

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[daftspunk]

Thanks @zoomyboy!

[mjauvin]

@daftspunk @LukeTowers aszbanas-extremecoding Is that documented somewhere ?

[LukeTowers]

@mjauvin here: octobercms/docs#409

[mjauvin]

I mean, shouldn't that be in october documentation?

…

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[LukeTowers]

@mjauvin @daftspunk might have to update the docs site for it to show up

[mjauvin]

@LukeTowers never mind, it's already in the docs, I thought that was a new option in the relation config file:

https://octobercms.com/docs/backend/relations#configuring-relation