[FIX] add property length on FilterGroup so SearchView.field knows that it has sub-filters and can display them
[FIX] add property length on FilterGroup so SearchView.field knows that it has sub-filters and can display them

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