[FIX] sale: free optional product

- Create a dynamic product P1 with an optional product P2
- The list price of P2 is 20
- Create a pricelist where P2 is free (fixed price of 0)
- In a SO, choose 'Configure a product' and choose P1, add

In the modal which suggests P2, its price is 20 instead of 0.

This is because we fall back on the list price when fetching the
combination prices.

This should not be necessary since:
- a pricelist is required to fetch a price
- a pricelist should always contain a rule applying to all products

Therefore, the list price doesn't need to be used as a fallback.

It is then necessary to modify the test tours by adding a partner on the
SO before selecting the product. Anyway, this is usually the way to go
since the selection of the partner determines the pricelist.

opw-1902456

closes odoo/odoo#28687

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