[FIX] account: set partner_id field of account.move as not required in the view
[FIX] account: set partner_id field of account.move as not required in the view

Having this field required in the view forbade the 'send for digitalization' button of account_invoice_extract to work, as it could be empty there (as the invoice was created via .create({})). The constraint defined in the view was checked before executing the code related to the button and caused everything to fail before running anything.

closes odoo/odoo#37279

Signed-off-by: Laurent Smet <1328e3a5817ff065354bd0f7f4073cbb6dcc7eca@users.noreply.github.com>

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