[FIX] avoid group droping in dummy_cell
[FIX] avoid group droping in dummy_cell

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