[Steven Zahm]

@ Omar Brenes

re: so we would have to delete them in each individual entry?

Yes, unfortunately so.

That said, there might be an alternative, try this…

Install the Code Snippets plugin.

Add a new snippet with the following code:

add_filter( 'cn_entry_output_meta_key', 'cn_skip_empty_entry_meta_value', 10, 4 );

function cn_skip_empty_entry_meta_value( $html, $atts, $key, $value ) {

    if ( 0 < strlen( $value ) ) return '';

    return $html;
}

Save and Activate the snippet.

This is untested, but if it works, it should “skip” rendering any meta keys where the value is empty.

Hope this helps, let me know.