Remove return value of _check_preconditions_on.
It's always None, now that we use exceptions.
Depends on !345 (closed).
Migrated from D4510 (view on Phabricator)
Staging instance, all changes can be removed at any time
It's always None, now that we use exceptions.
Depends on !345 (closed).
Migrated from D4510 (view on Phabricator)