[FIX]Fixed code for export xls null values should not shown in spreadsheet.
[FIX]Fixed code for export xls null values should not shown in spreadsheet.
MarkusTeufelberger/openerp-web,vnc-biz/openerp-web,splbio/openerp-web,vnc-biz/openerp-web,MarkusTeufelberger/openerp-web,gisce/openerp-web,vnc-biz/openerp-web,gisce/openerp-web,splbio/openerp-web,gisce/openerp-web,MarkusTeufelberger/openerp-web,splbio/openerp-web,vnc-biz/openerp-web