Prepares variables for views RSS item templates.
Default template: views-view-row-rss.html.twig.
array $vars: An associative array containing:
function template_preprocess_views_view_row_rss(&$vars) {
$item = $vars['row'];
$vars['title'] = check_plain($item->title);
$vars['link'] = check_url($item->link);
$vars['description'] = check_plain($item->description);
$vars['item_elements'] = empty($item->elements) ? '' : format_xml_elements($item->elements);
}