Return value of Kirby\Cms\Model::__toString() is null when called from $site

[tritos-design]

Describe the bug
Return value of Kirby\Cms\Model::__toString() is null when called from $site, e.g. by echo $site.

To Reproduce
Add echo $site to any template php file. This produces to above mentioned PHP error.

Expected behavior
__toString() should either return the empty string or throw an exception.

Kirby Version
3.4.2

[afbora]

Because Site has no id and Site::id() method doesn't exists. Calling as default Model::id() (parent class) method that returns null.

[bastianallgeier]

The biggest question here is, what would be a useful value to return in case of the Site object?

[afbora]

Would that be too bad for Site model? 🙈

public function id(): string
{
    return '';
}

[bastianallgeier]

I didn't want to add a new id method that just does nothing useful at all. So I only overwrote the __toString method in the site class and returned the URL there.