Do not print header section when no content meant for it

agaric/templates/layout/page.html.twig

@@ -45,11 +45,10 @@
 
 
 {% block header %}
-<section{{ header_section_attributes }}>
-
 {# We've moved the header section to the content level for nodes, with an
    exception for the front page. #}
 {% if not node or is_front %}
+<section{{ header_section_attributes }}>
   {% block header_title %}
   {% if page.header %}
   {# Header hero region #}
@@ -66,6 +65,7 @@
   </div>
   {% endif %}
   {% endblock header_title %}
+</section>
 {% endif %}
 
   {% block tabs %}
@@ -78,7 +78,6 @@
     </div>
   {% endif %}
   {% endblock tabs %}
-</section>
 {% endblock header %}