api: raw extrinsic metadata endpoint api fails with python exception about missing attribute
As reported by sentry [1], webapps (staging [2], prod [3] [4]) fails with a python exception.
It seems the current deployed version of the storage (v0.31) is out of sync with what the webapp expects (at least v0.32).
Fix it.
Migrated from T3436 (view on Phabricator)