Network Scan failed / devices with a empty/undefined profile is not supported

Network scan failed in case of scanning a notebook with Siemens-TIA Portal installed.

The PNIO role for such a "device" is empty/not any bits are set.

Supported roles are:

#define PNIO_DEVICE_ROLE_IOD            (0x01)  /**< IO-Device */
#define PNIO_DEVICE_ROLE_IOC            (0x02)  /**< IO-Controller */
#define PNIO_DEVICE_ROLE_IOC_IOD        (0x03)  /**< IO-Controller & IO-Device */
#define PNIO_DEVICE_ROLE_IOM            (0x04)  /**< IO-Multidevice */
#define PNIO_DEVICE_ROLE_IOS            (0x08)  /**< IO-Supervisor */