find a site url alert

src/server/views/layout/layout.html

@@ -131,6 +131,7 @@
   {% include '../modal/create_page.html' %}
   {% endblock  %} {# layout_head_nav #}
 
+  {% block head_warn_alert_siteurl_undefined %}{% include '../widget/alert_siteurl_undefined.html' %}{% endblock %}
   {% block head_warn_alert_siteurl_undefined %}{% include '../widget/alert_siteurl_undefined.html' %}{% endblock %}
   {% block head_warn_breaking_changes %}{% include '../widget/alert_breaking_changes.html' %}{% endblock %}