[FIX] point_of_sale: long product name completely visible

Current behavior:
When a product had a too long name, the name was truncated and couldn't
be completely seen.

Steps to reproduce:
- Change the name of a product to a very long name with spaces
- Open the POS
- The product name is truncated

Note:
To fix this we stop showing placeholders when a product doesn't have an
image set.

opw-3245538

closes odoo/odoo#121041

Signed-off-by: Heinz Robin (rhe) <rhe@odoo.com>