API oopsing with UnicodeEncodeError

The OOPS was triggered trying to retrieve a project that has UNICODE in its display name, title, and summary:
https://edge.launchpad.net/sachco

This is the client-side query that caused the OOPS (where 'lp' is a launchpad object):

>>> lp.projects['sachco']
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/home/bac/canonical/lp-branches/ws_ps/lib/launchpadlib/resource.py", line 534, in __getitem__
    representation = simplejson.loads(self._root._browser.get(url))
  File "/home/bac/canonical/lp-branches/ws_ps/lib/launchpadlib/_browser.py", line 180, in get
    response, content = self._request(url)
  File "/home/bac/canonical/lp-branches/ws_ps/lib/launchpadlib/_browser.py", line 170, in _request
    raise HTTPError(response, content)
launchpadlib.errors.HTTPError: HTTP Error 500: Internal Server Error
>>>

And here is the value of 'content' from the exception:

(Pdb) print e.content
'ascii' codec can't encode character u'\xe1' in position 1: ordinal not in range(128)

Traceback (most recent call last):
  File "/srv/edge.launchpad.net/edge/launchpad/lib/zope/publisher/publish.py", line 138, in publish
    result = publication.callObject(request, object)
  File "/srv/edge.launchpad.net/edge/launchpad/lib/canonical/launchpad/webapp/publication.py", line 327, in callObject
    return mapply(ob, request.getPositionalArguments(), request)
  File "/srv/edge.launchpad.net/edge/launchpad/lib/zope/publisher/publish.py", line 113, in mapply
    return debug_call(object, args)
  File "/srv/edge.launchpad.net/edge/launchpad/lib/zope/publisher/publish.py", line 119, in debug_call
    return object(*args)
  File "/srv/edge.launchpad.net/edge/launchpad/lib/canonical/lazr/rest/resource.py", line 460, in __call__
    return self.do_GET()
  File "/srv/edge.launchpad.net/edge/launchpad/lib/canonical/lazr/rest/resource.py", line 579, in do_GET
    media_type = self.handleConditionalGET()
  File "/srv/edge.launchpad.net/edge/launchpad/lib/canonical/lazr/rest/resource.py", line 160, in handleConditionalGET
    existing_etag = self.getETag(media_type)
  File "/srv/edge.launchpad.net/edge/launchpad/lib/canonical/lazr/rest/resource.py", line 512, in getETag
    values.append(str(value))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe1' in position 1: ordinal not in range(128)

Revision 6923 includes a fix for this bug.