[FIX] sale_payment: catch error at invoice creation

- Set up Paypal as described in
  https://www.odoo.com/documentation/user/11.0/ecommerce/shopper_experience/paypal.html
- Buy a product on the eCommerce.

The vendor might receive an email mentioning that Instant Payment
Notifications (IPN) are failing.

When completing the paypent process with Paypal, 2 confirmations of the
transaction will occur. The first one is through the route
`/payment/paypal/dpn` (Payment Data Transfer (PDT)), which takes place
right after the payment validation. The second confirmation comes
through the route `/payment/paypal/ipn` (Instant Payment Notification
(IPN)), which might arise with some delay (and potentially being run
several times).

Both confirmations will trigger the method `_generate_and_pay_invoice`,
which can raise an error if no invoiceable line is found ('There is no
invoiceable line.' in `sale` module). In this case, we should log the
error and move forward instead of crashing and stopping the workflow.

More information on PDT and IPN at
https://developer.paypal.com/docs/classic/ipn/integration-guide/IPNPDTAnAlternativetoIPN/

opw-1837196

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