model: Allow unresolved branches when computing Snapshot hash
This is needed by swh-scrubber when recomputing the hash of such snapshots.
Depends on !309 (closed).
Resolves swh-scrubber#4425 (closed).
Migrated from D8202 (view on Phabricator)
This is needed by swh-scrubber when recomputing the hash of such snapshots.
Depends on !309 (closed).
Resolves swh-scrubber#4425 (closed).
Migrated from D8202 (view on Phabricator)