Fix misbehaving Table::find_backlink_origin
Fix misbehaving Table::find_backlink_origin

Change-Id: I693a5f081bd6d99069d0711da6cd3a7adc522aa7

realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core