[entity vocab] fix bug introduced in 3.12 vs/ entity vocabulary, leading to some unexpected empty vocabulary. Fix test accordingly.
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')