Add missing configuration parameter for unified_multisite_dir when undefined.

Fichier

advagg_mod/advagg_mod.install, line 34

Code

function advagg_mod_update_8501() {
    $config = \Drupal::configFactory()->getEditable('advagg_mod.settings');
    if (!is_string($config->get('unified_multisite_dir'))) {
        $config->set('unified_multisite_dir', '');
        $config->save();
    }
}