Previously the description was used in the treeview if the title
was not present, however this is not possible in some cases, as
it may contain markup.
The the RSS code is changed so now if there is no title, the
description is used as the title, but with the html stripped from
it. We also have to consider that some description elements may
simply contain an html tag (and therefore no text). In that
case the URI is used as the title.
We strip HTML from "title" elements when required now. And we
always try to show at least the URI for feeds in the WebKit view.
And we fallback to using the URI in the treeview if the title/
description is empty.
