RSS link fields

I'm not sure if this is a bug in the RSS generator in PyDS 0.7.3 or a
bug in KNewsTicker.

Most of my PyDS articles don't have links.  When I click on them in
KNewsTicker, konqueror goes right to the article in my blog.

Some of my PyDS articles have a link to another article.  (What I mean
is that when I created the article, I put a URL in the Link field on the
form.)  When I click on those articles in KNewsTicker, konqueror goes to
the article of the link instead of the article in my blog.

The RSS in the former case doesn't have a <link>...</link> pair.  In the
latter case, there is a <link>...</link> pair.