show date without a bug link (bug 648926)

apps/blocklist/templates/blocklist/blocked_detail.html

@@ -44,6 +44,10 @@
     <footer>{% trans date = details.created|datetime, link = details.bug %}
       Blocked on {{ date }}. <a href="{{ link }}">View block request</a>.
     {% endtrans %}</footer>
+  {% else %}
+    <footer>{% trans date = details.created|datetime %}
+      Blocked on {{ date }}.
+    {% endtrans %}</footer>
   {% endif %}
 </div>