How to check exists relate post?

by default of your code:

<h3 class="item_view_heading">The same products</h3>
                    <ul class="jcarlist2 jcarousel-skin-tango">
			<?php do_action(
                            'related_posts_by_category',
                            array(
                                'orderby' => '',
                                'order' => 'DESC',
                                'limit' => 40,
                                'echo' => true,
                                'before' => '<li>',
                                'inside' => '',
                                'outside' => '',
                                'after' => '</li>',
                                'rel' => 'follow',
                                'type' => 'post',
                                'image' => 'thumbnail',
                                'message' => 'No matches'
                              )
                            ) ?>
                        </ul>

but in my template i want to check like this:

if(have_relate_post){
  do_action(
                            'related_posts_by_category',
                            array(...)
           )
}

Please tell me how to do it?

Thank you

http://wordpress.org/extend/plugins/related-posts-by-category/