Hi,
If you are working with our source code, I just pushed a change to the repository to make it use the forum page url as the channel link so that element won't be empty.
If you're using our pre-compiled releases you'll have to wait for the next release for that change.
One thing you could try in the meantime is run the feed through feedburner and use the feedburner output url in your reader. Possibly/probably they output a better version of the feed.
Hope that helps,
Joe