Valideer dat mensen met automatische incasso een IBAN hebben
One-sentence description
A member can now be set to be paying by direct debit, but not have a valid IBAN.
Current behaviour
A member can now be set to be paying by direct debit, but not have a valid IBAN. This creates empty records in !503 (merged).
Expected behaviour
Members should only be allowed to pay by direct debit if they have a valid IBAN.
Steps to reproduce
- Set a member's IBAN to the empty string
- Edit a member to say that they pay by direct debit
- Observe that this is possible
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