Fix problem when deleting multiple topics from a forum in bulk. We getting a list of topics from the database, then deleting each topic. But after you delete a topic, the forum.last_post on the remaining non-deleted topics can be stale. This was causing a weird DoesNotExist. Now just get the topics one at a time from the database.

{% extends 'base.html' %}
{% block title %}Shout Not Found{% endblock %}
{% block content %}
<div class="breadcrumbs"><a href="{% url shoutbox-history page=1 %}">Shoutbox History</a> &raquo; Shout Not Found</div>
<h2>Shout Not Found</h2>
<p>We're sorry, it looks like that shout no longer exists.</p>
{% endblock %}