在这种情况下，获取职位的期限，然后计算其中的职位数量。为WP\\u查询设置一个if条件以进行检查，该术语中的posts为零或大于零，然后为$args。

<?php 
    global $post;
    $term = get_term( \'hometwo\', \'Presenter-type\' );
    $posts_in_term = $term->count;
?>
<?php
if($posts_in_term > 0 ){
    $args = array(
            \'post_type\' => \'presenters\',
            \'posts_per_page\' => 1,
            \'tax_query\' => array(
                array (
                    \'taxonomy\' => \'Presenter-type\',
                    \'field\' => \'slug\',
                    \'terms\' => \'hometwo\'
                )
        )
    );
}
else{
    $args = array() //your default query;
}

$query = new WP_Query ( $args );
?>
<?php if ($query->have_posts()) : ?>
<?php while ($query->have_posts()) : $query->the_post(); ?>
    <a href="<?php the_permalink(); ?>">
    <?php the_post_thumbnail(); ?>
    <h3><?php the_title(); ?></h3>
    <p><?php the_excerpt(); ?></p></a>
    <?php endwhile; ?>
    <?php else : ?>
<?php endif; ?>
<?php wp_reset_query(); ?>