[Twisted-web] getBinding missing action?

[twisted-web@twistedmatrix.com]

exploring the getBinding() method in nevow/freeform.py
i can't understand the following code lines ..
 
to me its seems there is a missing assignment in the lines marked with (*) can anyone figure what the developer intention was?

def getBinding(self, context, name):
       
??? *** if self.bindingDict is None:
??? ***     self.getBindingNames(context)
???     if self.bindingDict is None:
???         self.bindingDict = {}
        binding = getattr(self, 'bind_%s' % name, getattr(self.boundTo, 'bind_%s' % name, None))
        print "-- self.boundTo --" , self.boundTo
        
        
        if binding is not None:
            binding = binding(context)
        else:
            try:
                binding = self.bindingDict[name]
            except KeyError:
                raise ImproperInputError, name
        binding.boundTo = self.boundTo
        return binding