Comment 4 for bug 726370

Remaining case -

  File "/srv/launchpad.net/codelines/lp-sourcedeps/eggs/zope.traversing-3.8.0-py2.6.egg/zope/traversing/adapters.py", line 138, in traversePathElement
    return traversable.traverse(nm, further_path)
  File "/srv/launchpad.net/codelines/trunk/lib/lp/app/browser/tales.py", line 607, in traverse
    return getattr(self, method_name)(extra_path)
  File "/srv/launchpad.net/codelines/trunk/lib/lp/app/browser/tales.py", line 1189, in link
    return self._makeLink(view_name, rootsite, self._context.displayname)
  File "/srv/launchpad.net/codelines/trunk/lib/lp/app/browser/tales.py", line 1174, in _makeLink
    css_class = ObjectImageDisplayAPI(person).sprite_css()
  File "/srv/launchpad.net/codelines/trunk/lib/lp/app/browser/tales.py", line 722, in sprite_css
    if context.is_valid_person:
  File "/srv/launchpad.net/codelines/trunk/lib/lp/services/propertycache.py", line 116, in __get__
    value = self.populate(instance)
  File "/srv/launchpad.net/codelines/trunk/lib/lp/registry/model/person.py", line 1243, in is_valid_person
    ValidPersonCache.get(self.id)

not sure what person its rendering to trigger this yet.