Enhancement when filter returns an empty url

[kybernetikservices]

Hi guys.

I'm the author of the plugin WP Sitemaps Config ​https://wordpress.org/plugins/wp-sitemaps-config/. One of the features is to explude pages and posts from the sitemap. To achieve this I use the filter wp_sitemaps_posts_entry
The apply_filters() function is located in class-wp-sitemaps-posts.php at line 140.

When a user decides to explude a page or post, I do return array( 'loc' => '' ) for this url. Unfortunatley this produces an empty line with <url><loc/></url> in the sitemap.
Google gives an error when reading this sitemap.

Sitemap can be read, but has errors
Invalid URL

To prevent this, the code in class-wp-sitemaps-posts.php at line 141 should be changed in

if( !empty( $sitemap_entry[ 'loc' ] ) ) {
  $url_list[]    = $sitemap_entry;
}

This would prevent a blank line if the URL is removed by the filter.

[swissspidy]

This filter is not meant for removing URLs.

You should modify the query args to do so, see ​https://make.wordpress.org/core/2020/07/22/new-xml-sitemaps-functionality-in-wordpress-5-5/

[kybernetikservices]

Thank you so much @swissspidy for your time and reply.
I will take this into account and modify my code.