Add custom 404 error message with link to "Create a New User" which is displayed when linkname in User Profile Developer view URL (/site/user/profile/<linkname>) doesn't exist. Add default value (None) to new_suffix parameter of template_helpers replaceSuffix and redirectToChangedSuffix functions.
# Please sort this file in alphabetical order by last (given) name.
# Please only include one name per line. If an (optional) email address is
# included, it must be RFC 2821 compliant (properly quoted, escaped, etc.).
# Lines beginning with # can be stripped from the file, as can blank lines.
"Todd Larsen" <tlarsen@google.com>
"Sverre Rabbelier" <sverre@rabbelier.nl>
"Pawel Solyga" <pawel.solyga@gmail.com>