ppa-generate-keys broken due to unicode issue

Since the 10.04 rollout ppa-generate-keys script has been failing with:

{{{
2010-05-04 22:00:41 INFO Generating signing key for PPA for Kristian Klette
2010-05-04 22:02:32 DEBUG Removing lock file: /var/lock/launchpad-ppa-
generate-keys.lock
Traceback (most recent call last):
 File "/srv/launchpad.net/codelines/current/cronscripts/ppa-generate-
keys.py", line 21, in <module>
   script.lock_and_run()
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/lp/services/scripts/base.py", line 280, in lock_and_run
   implicit_begin=implicit_begin, isolation=isolation)
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/lp/services/scripts/base.py", line 238, in run
   self.main()
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/lp/soyuz/scripts/ppakeygenerator.py", line 62, in main
   self.generateKey(archive)
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/lp/soyuz/scripts/ppakeygenerator.py", line 33, in generateKey
   archive_signing_key.generateSigningKey()
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/lp/archivepublisher/archivesigningkey.py", line 75, in
generateSigningKey
   secret_key = getUtility(IGPGHandler).generateKey(key_displayname)
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/canonical/launchpad/utilities/gpghandler.py", line 307, in
generateKey
   secret_keys = list(self.localKeys(result.fpr, secret=True))
 File "/srv/launchpad.net/codelines/ppa-
rev-9329/lib/canonical/launchpad/utilities/gpghandler.py", line 402, in
localKeys
   for key in ctx.keylist(filter, secret):
TypeError: first argument must be a string or sequence of strings
}}}

Maxb says:

{{{
The new pygpgme's result.fpr is now a unicode object, but apparently the filter argument to keylist is still wanted as a bytestring.
}}}