Check_MK Werk 8628: printer_alerts: Fix discovery when there are no alerts

ID: 8628 Title: printer_alerts: Fix discovery when there are no alerts Component: Checks & agents Level: 1 Class: Bug fix Version: 1.5.0i1 Previously, the discovery would only work, when the device listed some alerts, but not in the (hopefully more common) case that the list of alerts was empty. This has been fixed.