Handle displaying changes in an admin site with no user model view

Author: macro1

simple_history/templates/simple_history/object_history.html

@@ -28,7 +28,12 @@
                 <td>{{ action.get_history_type_display }}</td>
                 <td>
                   {% if action.history_user %}
-                    <a href="{% url admin_user_view action.history_user_id %}">{{ action.history_user }}</a>
+                    {% url admin_user_view action.history_user_id as admin_user_url %}
+                    {% if admin_user_url %}
+                      <a href="{{ admin_user_url }}">{{ action.history_user }}</a>
+                    {% else %}
+                      {{ action.history_user }}
+                    {% endif %}
                   {% else %}
                     None
                   {% endif %}