Fixing encoding error for payment label in logging

coin/billing/models.py

@@ -571,11 +571,11 @@ def payment_changed(sender, instance, created, **kwargs):
     if created:
         accounting_log.info("Adding payment %s (Date: %s, Member: %s, Amount: %s, Label: %s)."
                             % (instance.pk, instance.date, instance.member,
-                                instance.amount, instance.label))
+                                instance.amount, instance.label.encode('utf-8')))
     else:
         accounting_log.info("Updating payment %s (Date: %s, Member: %s, Amount: %s, Label: %s, Allocated: %s)."
                             % (instance.pk, instance.date, instance.member,
-                                instance.amount, instance.label,
+                                instance.amount, instance.label.encode('utf-8'),
                                 instance.amount_already_allocated))
 
     # If this payment is related to a member, update the accounting for