fix some gaps which would allow the temporary xml attributes 'parent_sequential_url' and 'index_in_children_list' to get persisted in the database, whereas they are meant to be only scoped during export/import
fix some gaps which would allow the temporary xml attributes 'parent_sequential_url' and 'index_in_children_list' to get persisted in the database, whereas they are meant to be only scoped during export/import

bmedx/modulestore,bmedx/modulestore,bmedx/modulestore