[8.0] skip invoice lines with value 0

intrastat_product/models/intrastat_product_declaration.py

@@ -501,6 +501,9 @@ class IntrastatProductDeclaration(models.Model):
             total_inv_weight = 0.0
             for inv_line in invoice.invoice_line:
 
+                if not inv_line.price_unit:
+                    continue
+                
                 if (
                         accessory_costs and
                         inv_line.product_id and