[FIX] point_of_sale: select employee with pin by barcode

When switching employee on point of sale, we may have a PIN to enter.

If we enter the barcode and there is a PIN, we get an "Invalid Password"
error.

Why:
====

When we switch with a barcode 12, the barcode system will catch events
and prevent their propagation:

- {'type': 'keypress', 'key': 49}
- {'type': 'keypress', 'key': 50}
- {'type': 'keypress', 'key': 13}

For respectively '1', '2', 'Newline'.

If it match an employee, the PIN number modal is opened which will
listen to KEYUP events => it receives very shortly:

- {'type': 'KEYUP', 'key': 13}

which is the newline character which follows the KEYPRESS.

With a "Return" key received, the PIN modale closes with empty value
and an error "Invalid Password" is shown.

Solution:
=========

Ignore the newline character if no number has been selected.

opw-2448585

closes odoo/odoo#66117

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Co-authored-by: Joseph Caburnay <jcb@odoo.com>

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