[FIX] stock: don't show empty Reserved group
[FIX] stock: don't show empty Reserved group

We hide the quants_grp if the stock.move is in the draft state. In this
case normally the value of the string_availability_info will be empty
anyway, because the _get_string_qty_information function skips moves in
the draft state.

This is especially useful on small displays, because on there the string
attribute of the field won't be shown, so you just end up with a
Reserved heading with nothing underneath it.

storm-computers/odoo,hip-odoo/odoo,dfang/odoo,storm-computers/odoo,laslabs/odoo,dfang/odoo,ygol/odoo,bplancher/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,dfang/odoo,ygol/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,ygol/odoo,ygol/odoo,bplancher/odoo,dfang/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,microcom/odoo,ygol/odoo,laslabs/odoo,microcom/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,dfang/odoo,bplancher/odoo,laslabs/odoo,hip-odoo/odoo,storm-computers/odoo,ygol/odoo,storm-computers/odoo,hip-odoo/odoo,laslabs/odoo,microcom/odoo,microcom/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,bplancher/odoo,microcom/odoo,microcom/odoo,storm-computers/odoo