如果WordPress中的第一篇帖子为空，如何获取最新帖子值

我正在处理wordpress自定义字段。我面临获取自定义字段值的问题，如果最新帖子自定义字段值为空，则显示第二个最新帖子或其他帖子自定义字段值。我的自定义字段是视频，如果最新帖子没有视频，则显示2个最新帖子视频值。我不知道如何获取最新的post自定义字段值。

这是我的代码：-

<?php 

                $page_num = $paged;
                if ($pagenum=\'\') $pagenum =1;
              while (have_posts()) : the_post(); 
                $args = array(
                    \'posts_per_page\'      => 1,
                    \'paged\' => $page_num,
                    \'order\' => \'DESC\',
                    \'orderby\' => \'post_date\',
                    \'offset\'=> 0,
                    \'meta_query\'  => array(
                        array(
                            \'key\' => \'video\'
                        )
                    )

                 );
                $loop = new WP_Query( $args );
                while ( $loop->have_posts() ) : $loop->the_post(); 
                $specials = get_post_meta( $post->ID,\'video\'); 
                foreach( $specials as $special): setup_postdata($special);

                echo \'<iframe width="699" height="269" src="http://www.youtube.com/embed/\'.$special.\'?controls=1&showinfo=0&rel=0" allowfullscreen></iframe>\';

                     endforeach;
                endwhile; 
                wp_reset_query();
             ?>

请告诉我任何解决方案。

$args = array( \'posts_per_page\' => 1, \'paged\' => (get_query_var(\'paged\')) ? get_query_var(\'paged\') : 1, \'order\' => \'DESC\', \'orderby\' => \'post_date\', \'meta_query\' => array( \'relation\' => \'AND\', array( \'key\' => \'video\', \'compare\' => \'EXISTS\' ), array( \'key\' => \'video\', \'value\' => \'\', \'compare\' => \'!=\' ) ) ); $loop = new WP_Query($args); if($loop->have_posts()) : while($loop->have_posts()) : $loop->the_post(); $specials = get_post_meta($post->ID, \'video\'); foreach($specials as $special): setup_postdata($special); echo \'<iframe width="699" height="269" src="http://www.youtube.com/embed/\'.$special.\'?controls=1&showinfo=0&rel=0" allowfullscreen></iframe>\'; endforeach; endwhile; wp_reset_postdata(); endif;

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