Errors when deleting non-empty CO

Attempt to delete non-empty CO fails.

Test case – Created new CO from template and added single org_identity, then attempted to delete. Garbage collection job failed with this message:

SQLSTATE[23503]: Foreign key violation: 7 ERROR: update or delete on table "cm_cos" violates foreign key constraint "cm_org_identities_co_id_fkey" on table "cm_org_identities" DETAIL: Key (id)=(14) is still referenced from table "cm_org_identities"

Initial attempt to expunge the offending org_identity and delete the CO again failed with "CoreJob.GarbageCollector not available" as the job apparently stopped running after the failure.  After switching to CO 1 and viewing CoreJob.GarbageCollector in the web interface the job was apparently requeued. (But the job still failed.)