wp show posts hide when no results

Hello!

I am using wp show posts and this code i found on google to display related posts by tags in my right sidebar.

<div class="wpsp-related-posts1  grid-container">
	<h2>Related Posts</h2>
<?php    
if ( is_single() ) {
        $tags =  get_the_tags();
        $tags_list = [];
        foreach ($tags as $tag)
            $tags_list[] = $tag->slug;
        $tag_string = implode( ', ', $tags_list);
    } else {
        $tag_string = get_tag( get_query_var( 'tag' ) );
    }

    $list = get_page_by_title( 'relatedtags', 'OBJECT', 'wp_show_posts' );
    wpsp_display( $list->ID, 'tax_term="' . $tag_string . '"' );
    ?>
</div>

I want to completely hide related posts by tags when there is no related results, instead of showing "Sorry, no posts were found."
Can you help me?