[FIX] event_sale: no company on SO

Do not crash at currency conversion when no company is set.

closes odoo/odoo#34155

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/event_sale/models/sale_order.py

@@ -83,7 +83,9 @@ class SaleOrderLine(models.Model):
         company = self.event_id.company_id or self.env.user.company_id
         currency = company.currency_id or self.env.user.company_id.currency_id
         self.price_unit = currency._convert(
-            self.event_ticket_id.price, self.order_id.currency_id, self.order_id.company_id, self.order_id.date_order or fields.Date.today())
+            self.event_ticket_id.price, self.order_id.currency_id,
+            self.order_id.company_id or self.env.user.company_id,
+            self.order_id.date_order or fields.Date.today())
 
         # we call this to force update the default name
         self.product_id_change()