Check for content, then remove from index

gistfile1.txt

add_action( 'init', 'check_for_content', 30 );
function check_for_content( $post_id ) {

	$args = array(
		'posts_per_page'   => -1,
		'offset'           => 0,
		'category'         => '',
		'category_name'    => '',
		'orderby'          => 'date',
		'order'            => 'DESC',
		'include'          => '',
		'exclude'          => '',
		'meta_key'         => '',
		'meta_value'       => '',
		'post_type'        => 'product',
		'post_mime_type'   => '',
		'post_parent'      => '',
		'author'	   => '',
		'post_status'      => 'publish',
		'suppress_filters' => true 
	);

	$posts = get_posts( $args );
	$i = 0;

	foreach ($posts as $post) {
		$content = $post->post_content;

		if ( empty($content) ) {
			update_post_meta( $post->ID, '_yoast_wpseo_meta-robots-noindex', 1 );
			update_post_meta( $post->ID, '_yoast_wpseo_meta-robots-nofollow', 1 );
			update_post_meta( $post->ID, '_yoast_wpseo_meta-robots-adv', 'none' );
		}
	}		
}