handle case where WWN not detected for a device (print error messages, but skip device collection & uploading).

collector/pkg/detect/detect.go

@@ -100,6 +100,12 @@ func (d *Detect) SmartCtlInfo(device *models.Device) error {
 		d.Logger.Info("Using WWN Fallback")
 		d.wwnFallback(device)
 	}
+	if len(device.WWN) == 0 {
+		// no WWN populated after WWN lookup and fallback. we need to throw an error
+		errMsg := fmt.Sprintf("no WWN (or fallback) populated for device: %s. Device will be registered, but no data will be published for this device. ", device.DeviceName)
+		d.Logger.Errorf(errMsg)
+		return fmt.Errorf(errMsg)
+	}
 
 	return nil
 }