Has anyone had any luck using getFirstLinkedFrame() and getNextLinkedFrame()?

I have been trying to write a script that would march down a set of linked 
frames, so I could analyze the content. getFirstLinkedFrame() seems to work as 
expected, but not getNextLinkedFrame(). The script spins and spins and spins 
and won't quit. 
The documentation says that if you do this:

textbox = scribus.getNextLinkedFrame()

it returns None if there are no more, but what "value" is assigned to textbox 
in that case? I'm trying to stop execution of frame content analysis when it 
reaches that point.
I even tried 

while (textbox):

thinking that would evaluate to 0 if there were no more, but that doesn't work. 
Trying to put str(textbox) into a messageBox() doesn't work.

Greg

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