[FIX] point_of_sale: don't race order destruction in customer display
[FIX] point_of_sale: don't race order destruction in customer display

By the time the product images are downloaded the current order object
may have already been destroyed. This can happen when e.g. clicking on
the 'Next order' button.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo