dont assume session invalid
dont assume session invalid

--HG--
extra : convert_revision : al%40openerp.com-20110317151813-nvmh8cr60aje92ea

splbio/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,splbio/openerp-web,gisce/openerp-web,MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,splbio/openerp-web