metadata-only: Relax mandatory constraint on slug
So it's not necessary to provide the slug for a metadata-only deposit.
Related to #2537 (closed)
Test Plan
tox
Migrated from D4494 (view on Phabricator)
Staging instance, all changes can be removed at any time
So it's not necessary to provide the slug for a metadata-only deposit.
Related to #2537 (closed)
tox
Migrated from D4494 (view on Phabricator)