fingerprint scanning throws errors sometimes if scanning lots of fingerprints

```
14:22:53.959 main - INFO 05a Scanning Wifi
14:22:53.959 scanWifi - INFO 05b Gathering fingerprint with '/sbin/iw dev wlan0 scan -u'
14:22:53.962 main - CRIT 05c Are you sure this computer has WiFi enabled?
14:22:53.962 main - CRIT 05d  exit status 240
```

Solution: just try again. Wait until errors accumulate. I.e. don't exit until 3+ errors in a row occur.
