This patches some issues I have with CGI::Untaint. You still need it installed
and you install handlers the same.
1) Instead of passing the empty string to the untaint handlers and relying on
them to handle it to everyones liking, it seems better
to have CGI::Untaint just say No input for field if the field is blank.
2) It adds the method raw_data to the get back the parameters the handler
was created with.