[FIX] purchase: prevent traceback when creating PO without company_id

when the user removes the company_id and add a line in the purchase order
then the issue is generated.

Steps to reproduce:

- Create a new purchase order.
- Remove the company_id in the Purchase order.
- Now add a line in PO. Select a product with the consumable product type.
- Traceback will be generated.

Applying these changes will resolve this issue.

Sentry-4215579151

closes odoo/odoo#124035

X-original-commit: 75edec6f73b70c4b9b86ad67bc838f468c2574b7
Signed-off-by: Tiffany Chang <tic@odoo.com>

addons/purchase/models/purchase.py

@@ -1227,10 +1227,10 @@ class PurchaseOrderLine(models.Model):
             return {'warning': warning}
         return {}
 
-    @api.depends('product_qty', 'product_uom')
+    @api.depends('product_qty', 'product_uom', 'company_id')
     def _compute_price_unit_and_date_planned_and_name(self):
         for line in self:
-            if not line.product_id or line.invoice_lines:
+            if not line.product_id or line.invoice_lines or not line.company_id:
                 continue
             params = {'order_id': line.order_id}
             seller = line.product_id._select_seller(