增加配置存在校验

[354651432]

https://github.com/laravel-admin-extensions/config/blob/183b7974725eec7c4845a442a248c5f847599a89/src/Config.php#L17

foreach (ConfigModel::all(['name', 'value']) as $config) {
                if (empty($config['name'])) {
                    config([$config['name'] => $config['value']]);
                }
            }