filter-remove-empty-p-in-shortcodes.php

/** 
 * Removes empty paragraph tags from shortcodes in WordPress.
 *
 * https://thomasgriffin.com/how-to-remove-empty-paragraph-tags-from-shortcodes-in-wordpress/
 */
function remove_empty_paragraph_tags_from_shortcodes_wordpress( $content ) {
    $to_fix = array( 
        '<p>['    => '[', 
        ']</p>'   => ']', 
        ']<br />' => ']'
    ); 
    return strtr( $content, $to_fix );
}
add_filter( 'the_content', 'remove_empty_paragraph_tags_from_shortcodes_wordpress' );