When there is a sale_order_line that has either no product_id nor
product_uom nor product_uom_qty (typically a section line),
the computing of the product_qty used in delivery return 0 for each
line below that sale_order_line.
OPW-2034915
Steps:
Create a SO
Add some lines
One should be a section (not the last line)
Save
Check product_qty on each line. The lines after the section will
have a product_qty = O
closesodoo/odoo#35010
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>