[9.x] Fix deprecation error in the route:list command

[bonzai]

Let's say you have a closure based route like this:

use Illuminate\Support\Facades\Route;
 
Route::get('/', function () {
    return 'Hello World';
});

After you run the route:list command, you'll see a deprecation warning in Laravel Telescope (under PHP 8.1), because there is no action defined for this route:

str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /var/www/[...]/RouteListCommand.php on line 403

• https://php.watch/versions/8.1/internal-func-non-nullable-null-deprecation