[FIX] account_payment_order: Computed non-stored fields needs always a value

We should assign a value for all records of the set.

account_payment_order/__manifest__.py

@@ -8,7 +8,7 @@
 
 {
     "name": "Account Payment Order",
-    "version": "14.0.1.0.3",
+    "version": "14.0.1.0.4",
     "license": "AGPL-3",
     "author": "ACSONE SA/NV, "
     "Therp BV, "

account_payment_order/models/account_payment_line.py

@@ -107,6 +107,8 @@ class AccountPaymentLine(models.Model):
                     line.company_id,
                     line.date or fields.Date.today(),
                 )
+            else:
+                line.amount_company_currency = 0
 
     def payment_line_hashcode(self):
         self.ensure_one()