Show related posts only when there are 1 or more

_layouts/post.html

@@ -55,6 +55,7 @@
 </div><!-- /#main -->
 
 <div class="footer-wrap">
+  {% if site.related_posts.size > 0 %}
   <div class="related-articles">
   <h4>You might also enjoy <small class="pull-right">(<a href="{{ site.url }}/posts/">View all posts</a>)</small></h4>
     <ul>
@@ -64,6 +65,7 @@
     </ul>
     <hr />
   </div><!-- /.related-articles -->
+  {% endif %}
   <footer>
     {% include _footer.html %}
   </footer>