webgui: repair of error when user without DB could not connect to device
webgui: repair of error when user without DB could not connect to device

CESNET/Netopeer-GUI,CESNET/Netopeer-GUI,CESNET/Netopeer-GUI,CESNET/Netopeer-GUI,CESNET/Netopeer-GUI,CESNET/Netopeer-GUI