jordi fita mas bbabf5c733 Use a null as product ID when adding new products to invoices
Otherwise, pgx (rightfully) tries to convert a "" into a integer, as
this is the field’s type, cannot, and panics with an error.

Added a IntegerOrNull method to FormField because this is exactly the
same that happens with the invoiceProductId, and made no sense to have
to do the logic twice, or in a function inside form.
2023-05-22 11:06:06 +02:00
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