use ensurePageExists during onSelectAll to fire note fetches
use ensurePageExists during onSelectAll to fire note fetches

Makes this event work with the previous get/set refactoring:
b5c46c30567c9ed6677d90753386b09957e1298c

openstax/tutor-js,openstax/tutor-js,openstax/tutor-js,openstax/tutor-js,openstax/tutor-js