[ADD] handle failure to save in ListView#ensure_saved: reject the deferred
[ADD] handle failure to save in ListView#ensure_saved: reject the deferred

akretion/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,akretion/openerp-web,havt/openerp-web