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I saw that additional try/except in the patch you mailed 
me - but I'm unsure exactly what it's catching. You have 
it reporting "Class not found". I presume that means you 
tried a "list some_unknown_class" or something. In that 
case, I think the do_list method should handle the 
exception, not the function invoker - since there's so 
many other ways different functions can raise a KeyError.