[FIX] web_kanban: do not show the '+' in kanban groups when user cannot create
[FIX] web_kanban: do not show the '+' in kanban groups when user cannot create

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