Resources edit page throws an error when Authentication is enabled

Resources edit page throws a "Fatal error: Unsupported operand types in /data/aegir/7.0/includes/form.inc on line 1682" when some form of authentication is enabled.

This appears to be due to services_auth_invoke() returning "TRUE" when invoking 'controller_settings' on an authentication module that doesn't implement it.

foreach ($endpoint->authentication as $auth_module => $auth_settings) {
      $settings_form = services_auth_invoke($auth_module, 'controller_settings', $auth_settings, $rop, $endpoint, $class, $name);
      //************* This is never empty due to services_auth_invoke() returning TRUE   ********************
      if (!empty($settings_form)) {
        $settings[$auth_module] = $settings_form;
      }
    }

Implications may be too wide ranging to propose a solution, from having services_auth_invoke() return FALSE, to updating the hook_services_authentication_info() requirements.