GUI reports GPS not working at DFNEXT005

[MartinCupak]

(experienced during 2017-04-11 .. 22 servicing trip)

This is written to the on-screen terminal after pressing a button:

Checking GPS status...
GPS STATUS:
GPS offline.

but in the interval test log, there is:

2017-04-22 15:11:57,212, DEBUG, interval_control_lin, 
transfer_status_file_written, unprocessed
2017-04-22 15:11:57,212, DEBUG, leostick, get_gps_from_leostick
2017-04-22 15:11:57,212, DEBUG, leostick, Request_GPS_info
2017-04-22 15:11:57,213, DEBUG, leostick, cmd_sent, G
2017-04-22 15:11:58,216, DEBUG, leostick, cmd_response, 
G$GPGGA,054156.000,3412.4486,S,13839.6893,E,1,19,0.6,368.79,M,2.8,M,,
2017-04-22 15:11:58,217, DEBUG, leostick, command_ok, G
2017-04-22 15:11:58,217, DEBUG, leostick, GPS_raw_string, 
$GPGGA,054156.000,3412.4486,S,13839.6893,E,1,19,0.6,368.79,M,2.8,M,,
2017-04-22 15:11:58,218, DEBUG, leostick, GPS_full_return, 
$GPGGA,054156.000,3412.4486,S,13839.6893,E,1,19,0.6,368.79,M,2.8,M,,
2017-04-22 15:11:58,218, DEBUG, leostick, get_gps_GGA
2017-04-22 15:11:58,218, DEBUG, leostick, gps_good_fix
2017-04-22 15:11:58,218, INFO, interval_control_lin, GPS_lonlat, 
138.661488333, -34.2074766667, 368.79, Y1