Pods template code not working, Please help fix

I am using the following code. technically the part {@_img.caption,,<p>,</p>} should work like, if the caption is not empty, you need to display or you should not display. But I see that the empty tags of P is always displaying. Am I missing anything?

[if download_links_2]
    <ul class="download_links"> 
      [each download_links_2] 
          <li>{@_img.caption,,<p>,</p>}<a href="{@_src,esc_url}">{@_img.title}</a></li> 
      [/each] 
    </ul> 
[/if]