Add empty state message for details column when no details are available

Author: FuzzyGrim

src/templates/app/components/details_column.html

@@ -12,5 +12,7 @@
         {% endif %}
       </div>
     </div>
+  {% empty %}
+    <div class="text-body-secondary">No details available</div>
   {% endfor %}
 </div>