[16.0][FIX] sale_stock_release_channel_partner_by_date: Avoid release channel reset

[santostelmo]

Avoid release channel reset when creating a SO.

Steps to replicate:

1. create a new sale order
2. select a customer
3. select a commitment date (Delivery Date) in the future that does not propose any release channel
4. select a release channel (any)
5. save

Results: on save, release channel is reset to empty
Expected behavior: on save, the release channel is kept

[OCA-git-bot]

Hi @sebalix,
some modules you are maintaining are being modified, check this out!

[sebalix]

A test to reproduce the issue is welcome

[sebalix]

I fixed the PR title, the commit should be fixed too (wrong module mentioned)

[sebalix]

Suggested change

	if channel_date:
	rec.release_channel_id = channel_date.release_channel_id
	forced_release_channel_id = self.env.context.get("order_release_channel_id", {}).get(rec.id)
	if not channel_date and forced_release_channel_id:
	rec.release_channel_id = forced_release_channel_id
	continue
	rec.release_channel_id = channel_date.release_channel_id

[santostelmo]

That implementation doesn't seem to be possible:

1. I don't know why but context variable passed in create order_release_channel_id never reach _compute_release_channel_id
2. We can't know the id of the record before creating it.