Valideer dat mensen met automatische incasso een IBAN hebben

Ghost User
2017-11-22T15:51:50+01:00

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.

### Expected behaviour

Members should only be allowed to pay by direct debit if they have a valid IBAN.

### Steps to reproduce

1. Set a member's IBAN to the empty string
2. Edit a member to say that they pay by direct debit
3. Observe that this is possible