Display the text – No content

hy i have the code:

<?php if(get_field('trailere_filme') != ""){foreach(get_field('trailere_filme') as $post_object): ?>
<div class="box-trailere">
<div class="trailer-img">
<a href="<?php echo get_permalink($post_object->ID); ?>" rel="bookmark" title="<?php printf(__('Trailer film %s', 'kubrick'), the_title_attribute('echo=0')); ?>">
<span class="tip"><?php echo get_field( 'tip', $post_object->ID ); ?></span>
<span class="trai-hov"></span>
<img src="https://img.youtube.com/vi/<?php echo get_field( 'trailer', $post_object->ID ); ?>/<?php echo get_field( 'img_trailer', $post_object->ID ); ?>" alt="Trailer <?php echo get_the_title($post_object->ID) ?>" title="Trailer <?php echo get_the_title($post_object->ID) ?>"></a>
<span class="duration"><?php echo get_field( 'time', $post_object->ID ); ?></span>
</div>
<span class="trailer-title"><a href="<?php echo get_permalink($post_object->ID); ?>" title="Trailer <?php echo get_the_title($post_object->ID) ?>"><?php echo get_the_title($post_object->ID) ?></a></span>
</div>
<?php endforeach;}?>

When i dont put annyting in the custom field box, it wont apear nothing, i want to apear.. a text someting like…

“There are no trailers for this movie”

I hope you understand.
Thanks