[IMP] QWeb: raise an actual error instead of a string
[IMP] QWeb: raise an actual error instead of a string

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