We now display only the lines that have documents linked to them. In case, we want to display a line even if there are no doc, we can do so by updating the list of counter to keep with "getCountersToKeep()". In case, there are no lines, we display a small message. For now we always display the quotations, sale orders and invoices. task-2947778 closes odoo/odoo#99373 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>