Send notifications for all polling errors

When I receive a transaction alert I sometimes remember my account balance and calculate the new balance myself and I sometimes log to my Kresus to know the new balance.

If I don't receive any new transaction alert I think I still have the same account balance. But that's not the case if a polling error occurred, so I'd really like a notification for all polling errors (currently Kresus only sends them if an action is required).