domain_form_alter breaks authorize.php form action

At the last step of module updates, the submit button action is incorrectly set by domain_form_alter. $domain = domain_initial_domain(); returns null. Since this is an early stage of bootstrap, perhaps we may need to domain_init() in domain_initial_domain(), per se:

function domain_initial_domain($domain = array()) {
  static $initial;
  if (!isset($initial) && !empty($domain)) {
    $initial = $domain;
  }
  if (!isset($initial)) domain_init();
  return $initial;
}