fix: str_replace(): Passing null warning

[usernotnull]

On PHP 8, we can't pass null to str_replace, it will generate a warning.

I'll make a PR to add a null check, which will remove the warning on many requests.

[iwasherefirst2]

This issue only occurs when incorrect attributes are passed to getURLFromRouteNameTranslated. To handle this properly, I believe the function should throw an exception if the value is null.

This would help prevent unexpected behavior and make it clear that the provided attributes are incomplete or invalid.

Do you agree @jordyvanderhaegen ?

[jordyvanderhaegen]

Ideally this is the same behaviour as Laravel's route method, where a UrlGenerationException is thrown when passing null as a route parameter.

route('posts.show', ['post' => null]);

// Illuminate\Routing\Exceptions\UrlGenerationException
// Missing required parameter for [Route: posts.show] [URI: blog/posts/{post}] [Missing parameter: post].

https://github.com/laravel/framework/blob/11.x/src/Illuminate/Routing/RouteUrlGenerator.php#L89-L91
https://github.com/laravel/framework/blob/11.x/src/Illuminate/Routing/RouteUrlGenerator.php#L187-L208