[FIX] payment_authorize: no partner email
[FIX] payment_authorize: no partner email

When no email is defiend on the partner, a traceback is raised when
paying with Authorize.net.

The `text` attribute requires a string, not a boolean (`False` in this
case).

opw-728301

ygol/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,hip-odoo/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo