hide expiry date unless has value

app/templates/tasks.html

@@ -28,7 +28,9 @@
                 </b>
                 <div>
                     <p>Created: {{ createdTime.strftime('%Y-%m-%d %I:%M %p') }}</p>
+                    {% if task.expiry_date != None %}
                     <p>Expires: {{ task.expiry_date }}</p>
+                    {% endif %}
                 </div>
                 <hr>
             </div>