[FIX] sale: sometimes an invoiced quantity could be 0, need to avoid divide by 0 error

addons/sale/sale_analytic.py

@@ -39,6 +39,8 @@ class AccountAnalyticLine(models.Model):
     so_line = fields.Many2one('sale.order.line', string='Sale Order Line')
 
     def _get_invoice_price(self, order):
+        if self.unit_amount == 0.0:
+            return 0.0
         price_unit = abs(self.amount / self.unit_amount)
         if self.currency_id and self.currency_id != order.currency_id:
             price_unit = self.currency_id.compute(price_unit, order.currency_id)