As some payment acquirers require the email to be set,
a warning is shown when generating a payment link if
the partner does not have an email.
OPW-2254011
closesodoo/odoo#51857
X-original-commit: 6f61e89ab9b947ca54cfd8dbd5470083a625d24e
Signed-off-by: Damien Bouvy (dbo) <dbo@odoo.com>