Decode from webcam with no device attached

Hi there,

I tried QtQR on two computers, on both Fedora-FC18 is running.

One computer does have a built-in webcam - no problems here.

The other computer does not have a webcam attached.
If I click on "Decode from webcam", QtQR does not really crash (it's still usable afterwards), but I get an allert of Fedora's "ARBT" every time.

"ARBT" is some kind of automatic bug-reporting tool, which seems to dislike clicking on this specific QtQR-function with no camera attached.

If I start QtQR from console, I can see some error-messages:
Traceback (most recent call last):
  File "/usr/bin/qtqr.py", line 637, in decodeWebcam
    vdDialog = VideoDevices()
  File "/usr/bin/qtqr.py", line 674, in __init__
    for vd in self.getVideoDevices():
  File "/usr/bin/qtqr.py", line 703, in getVideoDevices
    for dev in os.listdir("/dev/v4l/by-id"):
OSError: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/dev/v4l/by-id'

Of course no camera can be found on this system - but would it be possible to encance present code of QtQR-app in a way not resulting in an ARBT-alert, anymore?

Thanks!