[FIX] point_of_sale: include untaxed amounts in tax lines

If some orders have no taxes (e.g. manual reimbursement with a negative amount)
the sum of taxes lines gave a different result than the total amount sold.

e.g.:
order 1: price 10€, including 2€ for taxes
order 2: price -5€, no taxes

report:
  taxes:
   20%, 2€ taxes, 8€ base amount

  total sold:
   5€

2+8 != 5

Also change line.price_subtotal as it was computed twice if there was two taxes
on a line (although it will probably never happen in the pos)

opw-805415

addons/point_of_sale/i18n/point_of_sale.pot

@@ -1649,6 +1649,12 @@ msgstr ""
 msgid "No sequence defined on the journal"
 msgstr ""
 
+#. module: point_of_sale
+#: code:addons/point_of_sale/models/pos_order.py:986
+#, python-format
+msgid "No Taxes"
+msgstr ""
+
 #. module: point_of_sale
 #. openerp-web
 #: code:addons/point_of_sale/static/src/js/screens.js:2018

addons/point_of_sale/models/pos_order.py

@@ -981,7 +981,10 @@ class ReportSaleDetails(models.AbstractModel):
                     for tax in line_taxes['taxes']:
                         taxes.setdefault(tax['id'], {'name': tax['name'], 'tax_amount':0.0, 'base_amount':0.0})
                         taxes[tax['id']]['tax_amount'] += tax['amount']
-                        taxes[tax['id']]['base_amount'] += line.price_subtotal
+                        taxes[tax['id']]['base_amount'] += tax['base']
+                else:
+                    taxes.setdefault(0, {'name': _('No Taxes'), 'tax_amount':0.0, 'base_amount':0.0})
+                    taxes[0]['base_amount'] += line.price_subtotal_incl
 
         st_line_ids = self.env["account.bank.statement.line"].search([('pos_statement_id', 'in', orders.ids)]).ids
         if st_line_ids: