src/CarteBlanche/App/Locator.php
public static function fallback($file = null, $path = null)
    {
        $user_dir = CarteBlanche::getPath('user_path');
        if (file_exists($user_dir.$file)) {
            return $user_dir.$file;
        } else {
            return $path;
        }
    }
public static function fallback($file = null, $path = null)
    {
        $user_dir = CarteBlanche::getPath('user_path');
        if (file_exists($user_dir.$file)) {
            return $user_dir.$file;
        } else {
            return $path;
        }
    }
For user overridings
This will search a version of `$file` in `user/` and return it in replacement if so.

@param   string  $file   The relative file path to search
@param   string  $path   The default file path
@return  string