Clean up empty tags in the_content

functions.php

<?php
add_filter('the_content', 'remove_empty_p', 20, 1);
function remove_empty_p($content){

    // clean up p tags around divs
    $content = str_replace(array('<p><div', '</div></p>'), array('<div', '</div>'), $content);
    $content = force_balance_tags($content);
    return preg_replace('#<p>\s*+(<br\s*/*>)?\s*</p>#i', '', $content);
}