我试图列出一些按自定义字段值（“空格注释”）排序的帖子。它工作得很好，但是，当自定义字段为空时，循环无法获取此帖子。

有没有办法修复它？谢谢：）

            $args = array( 
                \'post_type\' => \'spaces\',
                \'post_per_page\' => \'500\',
                \'meta_key\' => \'space-comments\',                 
                \'orderby\' => \'meta_value_num\',                  
                \'order\' => \'DESC\',
                \'author__in\' => $tradicionalIds,
                    \'meta_query\' => array(
                        \'relation\' => \'AND\',                            

                        array(
                            \'key\' => \'space-city\',
                            \'value\' => $search,
                            \'compare\' => \'LIKE\'
                       ),
                        array(
                            \'key\' => \'space-comments\',
                            \'compare\' => \'EXISTS\',                              
                        ),          

                    )
                );



            $query = new WP_query($args);