Merge branch 'bug/htAmount' into 'master'

HtAmount return statement

See merge request !1

djangoldp_invoice/models.py

@@ -60,9 +60,11 @@ class CustomerInvoice(Model):
     invoicingDate = models.DateField(default=datetime.date.today)
 
     def htAmount(self):
+        htAmount = Decimal(0)
         if self.batches is None:
-            return self.batches.aggregate(total=Sum('tasks__htAmount'))['total']
-        return 0
+            htAmount = self.batches.aggregate(total=Sum('tasks__htAmount'))['total']
+
+        return htAmount
 
     def tvaAmount(self):
         return Decimal(self.tvaRate * self.htAmount() / Decimal(100))