def show_picture(self, data):
        raise NotImplementedError
returns a username for a given manifest name
dataset/ETHPy150Open pascalw/Airplayer/airplayer/mediabackends/base_media_backend.py/BaseMediaBackend.show_picture--crossover with--dataset/ETHPy150Open munki/munkiwebadmin/manifests/models.py/Manifest.findUserForManifest