[FIX] add correct toString for KeyNotFound and ObjectNotFound
[FIX] add correct toString for KeyNotFound and ObjectNotFound

--HG--
extra : convert_revision : xmo%40openerp.com-20110331122018-1p122l55tdf325lq


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