Remove last used message if key’s never been used

I don’t think it adds anything to tell you that a key’s never been used.
The value of the ‘key was used 3 minutes ago’ message is in stopping you
accidentally revoking something you shouldn’t have.

app/main/views/templates.py

@@ -436,7 +436,7 @@ def delete_service_template(service_id, template_id):
         )
     except HTTPError as e:
         if e.status_code == 404:
-            message = 'It’s never been used.'.format(template['name'])
+            message = None
         else:
             raise e
 

app/templates/views/templates/template.html

@@ -30,9 +30,11 @@
   {% elif template_delete_confirmation_message %}
     <div class="bottom-gutter">
       {% call banner_wrapper(type='dangerous', subhead=template_delete_confirmation_message[0]) %}
-        <p>
-          {{ template_delete_confirmation_message[1] }}
-        </p>
+        {% if template_delete_confirmation_message[1] %}
+          <p>
+            {{ template_delete_confirmation_message[1] }}
+          </p>
+        {% endif %}
         <form method='post'>
           <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
           <input type="submit" class="button" name="delete" value="Confirm" />