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I’m sorry I only read your patch and did not see the NoLen class above Blocked. (I blame the lack of Reitveld review link.) I still think __getitem__() should have a valid signature, but I acknowledge that it’s not really your fault. :)
My main concern about the documentation was that in your patch you say _all_ special methods are now allowed to be None, but in your code you only check __iter__(). This is adding new undocumented inconsistencies e.g. with Iterable vs Container. Maybe it would be better to only say that setting __iter__ to None is supported, instead of setting any special method.