[16.0->18.0] No error when creating a SEPA mandate with a non-IBAN bank account

[alexis-via]

Scenario of the bug:

1. Install the module account_banking_sepa_direct_debit
2. On partner X, create a non-IBAN bank account (account type = normal)
3. Create a SEPA mandate linked to that bank account and save => NO ERROR !
4. Validate the mandate => NO ERROR !

Houston, we have a problem :)

[alexis-via]

My PR https://github.com/OCA/bank-payment/pull/1174/files fixes the bug

[github-actions]

There hasn't been any activity on this issue in the past 6 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days.
If you want this issue to never become stale, please ask a PSC member to apply the "no stale" label.

[alexis-via]

The bug is still present in v18: