[FIX] point_of_sale: traceback on printing android
[FIX] point_of_sale: traceback on printing android

Firefox for android gives atraceback when clicking the print receipt
button. This traceback is caused becaus Firefox for Android does not
support printing.

This fix replaces the traceback by an explanation why it is not possible
to print.

Also  backport for safari-fix

closes odoo/odoo#28919
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo