[issue3720] segfault in for loop with evil iterator

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

The next-nevernull patch is much cleaner than I expected.  Nice work.

The assertion in abstract.c can be changed to:
   assert(iter==PyObject_NextNotImplemented || PyIter_Check(iter));

Armin, are you happy with the new approach?  Though "del obj.next" 
isn't doing exactly what you would expect, that seems harmless to me.

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