[FIX] website_sale_comparison: Tuple index out of range
[FIX] website_sale_comparison: Tuple index out of range

Some product template with attributes never have variants because
the attributes have the field 'create_variant' set to 'no_variant'
So "Tuple index out of range" was raised due to these kind of products.

opw:1911962

closes odoo/odoo#29428
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo