private function getListDataClass() {
        /**
         * Silverstripe-recipe 4.3.0 introduces changes that broke the
         * previous approach to retrieving the model class.
         *
         * This is/will be fixed in silverstripe-recipe 4.3.1
         *
         * We've taken this approach so that Multisites can work with
         * SS 4.3.0 so long as you don't use the MultisitesAware extension.
         */
        if ($this->listDataClass === null) {
            // only true if silverstripe-recipe > 4.3.0
            if ($this->owner->hasMethod('getModelClass')) {
                $this->listDataClass = $this->owner->getModelClass();
            }
            // else false to bypass the MultisitesAware extension
            else {
                $this->listDataClass = false;
            }
        }
        return $this->listDataClass;
    }