[imp] small improvement for o2m & on_change
[imp] small improvement for o2m & on_change

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