Comment 1 for bug 1060784

The four cases are consistent (in a hyperlink where the target isn't specified explicitly, the literal content of the brackets is used as the target and the text is parsed), but the result doesn't make much sense. I don't like the empty <b></b> etc. after the link, either. At least the result is valid HTML.
Since syntax errors don't exist in Creole, I think the best solution is to discard markup in the link target.