If you want to try it, feel free to try attaching a file to bug #404680: https://sourceforge.net/tracker/index.php?func=detail&aid=404680&group_id=5470&atid=305470 )
The SF admin request for this problem is at http://sourceforge.net/tracker/?func=detail&atid=100001&aid=404688&group_id=1, but it's better if I collect the results and summarize them in a single comment.
My conclusion: the file upload is refused iff the comment is empty -- in other words the complaint about an empty comment is coded wrongly and should only occur when the comment is empty *and* no file is uploaded. Or maybe they want you to add a comment with your file -- that's fine too, but the error isn't very clear. http or https made no difference. I used NS 4.72 on Linux; Tim used IE and had the same results. --Guido van Rossum (home page: http://www.python.org/~guido/)