[#2302] only show about title if standard text

ckan/templates/home/about.html

@@ -9,11 +9,11 @@
 {% block primary %}
   <article class="module">
     <div class="module-content">
-      <h1 class="page-heading">{{ _('About') }}</h1>
       {% block about %}
         {% if g.site_about %}
           {{ h.markdown_extract(g.site_about) }}
         {% else %}
+          <h1 class="page-heading">{{ _('About') }}</h1>
           {% snippet 'home/snippets/about_text.html' %}
         {% endif %}
       {% endblock %}