Checkmk Werk 11626: if-checks: handle levels for non-unicast packets and discards correctly

ID: 11626 Title: if-checks: handle levels for non-unicast packets and discards correctly Component: Checks & agents Level: 1 Class: Bug fix Version: 2.0.0i2 When levels on non-unicast packets or discards are configured and exceeded, the interface checks are supposed to produce additional output, but not additional metrics. This was not the case, which led to a bug and crashed the if-checks. This has been fixed.