Changes on cover attributes (bg-color, size) were not saved properly when no other option where changed on the object. task-2547729 closes odoo/odoo#75890 X-original-commit: 6d00c5ac0346beb57eef2192fe21a45a1158d87e Signed-off-by: Antoine Guenet <Zinston@users.noreply.github.com>