[FIX] account: show taxes when they are zero on invoices print
[FIX] account: show taxes when they are zero on invoices print

- Create a 0 % tax
- Create an invoice with a line using the 0 % tax
- Print the invoice

The 0 % tax is not shown in the 'Tax amount by group' summary, while it
should be.

In 12.0, the 0 % is created in `account.invoice.tax`, therefore the tax
is shown. However, in 13.0 there is no `account.invoice.tax` anymore,
and no journal item is created for a zero amount. Therefore, the tax is
not shown.

We explicitly loop on the zero taxes and add them in the 'Tax amount by
group'.

opw-2209343

closes odoo/odoo#47092

X-original-commit: 37a0f7acae8aebef35577b178f8aeefed11c9105
Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>

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