Prepares a vertical_tabs element for rendering.
array $element: An associative array containing the properties and children of the vertical tabs element.
array The modified element.
function form_pre_render_vertical_tabs($element) {
// Do not render the vertical tabs element if it is empty.
$group = implode('][', $element['#parents']);
if (!element_get_visible_children($element['group']['#groups'][$group])) {
$element['#printed'] = TRUE;
}
return $element;
}