private function getListingOrder($contentType)
    {
        // An empty default isn't set in config yet, arrays got to hate them.
        if (isset($contentType['taxonomy'])) {
            $taxonomies = $this->getOption('taxonomy');
            foreach ($contentType['taxonomy'] as $taxonomyName) {
                if ($taxonomies[$taxonomyName]['has_sortorder']) {
                    // Let getContent() handle it
                    return null;
                }
            }
        }

        return $this->getOption('theme/listing_sort') ?: $this->getOption('general/listing_sort');
    }