added parent is_productive field

templates/list.html

@@ -7,7 +7,7 @@
 {% block main %}
     <ul class="list">
         {% for element in elements %}
-            <li data-id="{{ element.id }}">
+            <li data-id="{{ element.id }}" class="{% block extra-class %}{% endblock %}">
                 {% block element %}{% endblock %}
                 <div class="actions">
                     {% block actions %}{% endblock %}