Only display contact info when necessary

hiboo/user/templates/user_details.html

@@ -18,10 +18,12 @@
           <dt>{% trans %}Created at{% endtrans %}</dt>
           <dd>{{ user.created_at }}</dd>
 
+          {% if user.contact %}
           {% for name, value in user.contact.items() %}
           <dt>{{ name | capitalize }}</dt>
           <dd>{{ value }}</dd>
           {% endfor %}
+          {% endif %}
         </dl>
       </div>
       </div>