Problems limiting get_next_by_FOO inside a django view?

have used get_next_by_FOO inside my view to display an absolute url
for the following item within a set of records however when it gets to
the end of the query set an error is raised.

how do I stop my view from raising this error and instead just
outputting some html letting me know that it has come to the end of
the set?

All help is greatly appreciated.

def news_view(request, url):
news = get_object_or_404(Body, url=url)
next = news.get_next_by_published()
pre = news.get_previous_by_published()
return render_to_response('news/news_view.html', {
'news': news,
'pre': pre,
'next': next
}, context_instance=RequestContext(request)

current template
<a href="{{ next.get_absolute_url }}">Next News</a></p>
<a href="{{ pre.get_absolute_url }}">Previous News</a></p>

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