How to make Noidex for a page if the result is empty?

Question

WordPress

Hello. The site generates a list of posts through WP_Query

$args = array(
    'posts_per_page' => 50,
    'post_type' => 'uslugi',
    'region' => $cat_slug,
    's' => carbon_get_post_meta(get_the_ID(), 'o_seokey'),
    'relevanssi' => true,
);
// запрос
$query = new WP_Query( $args ); ?>
<?php if ( $query->have_posts() ) : ?>
    <?php while ( $query->have_posts() ) : $query->the_post(); ?>
      <?php get_template_part('parts/loop'); ?>
    <?php endwhile; ?>
    <?php wp_reset_postdata(); ?>
<?php else : ?>
    <p><?php esc_html_e( 'Ничего не найдено.' ); ?></p>
<?php endif; ?>

How to display in head tag if "Nothing found".
I'm using the yoast plugin, is it possible to put add_action in the head noindex through it?

Answer 1

Use wp_no_robots
https://developer.wordpress.org/reference/function...
Only output BEFORE wp_head() probably if the code is in a template