[FIX] payment_stripe: allow payment for client without mail

Problem: If you have a customer assigned to an invoice/quotation
without an e-mail address and then share a payment link with
the customer. If the customer clicks on 'Pay', he won't be
redirected to Stripe's checkout page. He'll get instead 'Invalid
e-mail address: False' (see the image attached).

Explanation:
When there is no e-mail address defined, Odoo sends 'False' to
Stripe but Stripe sees it as the e-mail address which is indeed
Invalid. To solve the issue we replace False by None for the email
value of a customer without email address.

opw-3007866

closes odoo/odoo#102867

X-original-commit: 647a5fd79b88d4ea00eca2d6c1f9d9a2259a8414
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
Signed-off-by: Fockedey Martin (mafo) <mafo@odoo.com>

addons/payment_stripe/models/payment_transaction.py

@@ -146,7 +146,7 @@ class PaymentTransaction(models.Model):
                 'address[postal_code]': self.partner_zip or None,
                 'address[state]': self.partner_state_id.name or None,
                 'description': f'Odoo Partner: {self.partner_id.name} (id: {self.partner_id.id})',
-                'email': self.partner_email,
+                'email': self.partner_email or None,
                 'name': self.partner_name,
                 'phone': self.partner_phone or None,
             }