[FIX] account: Traceback when setting payment amount to 0

As `_compute_journal_domain_and_types` method is defined in an abstract model
and `has_invoices` method is defined in account.payment model, there is a case
where strangely `_compute_journal_domain_and_types` is called in the
abstract.register.payment itself and, since the model does not have that
method, an AttributeError is raised.

closes odoo/odoo#32847

Signed-off-by: Quentin De Paoli (qdp) <qdp@openerp.com>