Perhaps this is useful: http://www.djangosnippets.org/snippets/546/
It even has a ticket: http://code.djangoproject.com/ticket/6398 with,
of course, ensuing discussion.
>
> I was looking at jinja[1] and there was one feature which I really
> liked
> "for loops have an optional else block executed if there was no
> iteration."
>
> Right now most of my for loops are like,
>
> {% if comments %}
>
> {% for comment in comments %}
> {{comment}}
> {% endfor %}
>
> {% else %}
> There are no comments.
> {% endif %}
>
> It would be much `cooler` to write
>
> {% for comment in comments %}
> {{comment}}
> {% else %}
> There are no comments.
> {% endfor %}
>
> Of course this is not a huge improvement, but I need to do this so
> many times, might be this is a common use case. :)
> >
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