Crashes when username and password are null

Ubuntu 10.10
gtkvncviewer-0.4-2.2

I created a profile for a host that I'm doing a remote install on using anaconda that doesn't require a username or password. When I tried running gtkvncviewer again after saving the profile I got the following error:

Traceback (most recent call last):
  File "./gtkvncviewer.py", line 428, in <module>
    instance = GtkVncViewer()
  File "./gtkvncviewer.py", line 136, in __init__
    username, password = secret.split('\n')
ValueError: need more than 1 value to unpack

It doesn't handle the fact that the username and password are both null.

As a quick fix, I managed to get it working correctly with the attached patch though I don't know if that's the best way to handle the exception.