code: def getMugshot(self):
          
          mugshot = self.store.findUnique(
              Mugshot, Mugshot.person == self, default=None)
          if mugshot is not None:
              return mugshot
          return Mugshot.placeholderForPerson(self)
docs: Return the L{Mugshot} associated with this L{Person}, or an unstored
          L{Mugshot} pointing at a placeholder mugshot image.