Fixed a bug with Atom feed "link" elements.  As a note for future reference: if a feed item is a dictionary and one of that dictionary's values is None, everything breaks.  We should test for this in future to prevent problems.
Fixed a bug with Atom feed "link" elements.  As a note for future reference: if a feed item is a dictionary and one of that dictionary's values is None, everything breaks.  We should test for this in future to prevent problems.

pombredanne/feedformatter