[FIX] sale: allow to import quotations without lines description

When importing a quotation,
if the lines `name`, `price_unit`, `product_uom` or `tax_id`
are not specified, but the product is,
retrieve them from the product `on_change`

This was the case in Odoo 8.0,
it was done as well in the override `create` method
of `sale.order.line`

opw-675434

addons/sale/sale.py

@@ -601,6 +601,13 @@ class SaleOrderLine(models.Model):
 
     @api.model
     def create(self, values):
+        onchange_fields = ['name', 'price_unit', 'product_uom', 'tax_id']
+        if values.get('order_id') and values.get('product_id') and any(f not in values for f in onchange_fields):
+            line = self.new(values)
+            line.product_id_change()
+            for field in onchange_fields:
+                if field not in values:
+                    values[field] = line._fields[field].convert_to_write(line[field])
         line = super(SaleOrderLine, self).create(values)
         if line.state == 'sale':
             if (not line.order_id.project_id and