functions.php 文件添加：

/**
 * 删除文章内<p>&nbsp;<p>空段落 wpautop()
 */
function remove_empty_p( $content ) {  
    $content = force_balance_tags( $content );
    $content = preg_replace( '#<p>\s*+(<br\s*/*>)?\s*</p>#i', '', $content );
    $content = preg_replace( '~\s?<p>(\s|&nbsp;)+</p>\s?~', '', $content );
    return $content;
}
add_filter('the_content', 'remove_empty_p', 20, 1);