[Cython] hasattr() swallows any exception (Py<3.2)

[Lisandro Dalcin]

Take a look here: http://bugs.python.org/issue9666

'hasattr' default behaviour should be changed to suppress only
AttributeError exceptions.  Other should pass through.

Should we do something about this in Cython? We currently use
PyObject_HasAttr(), but even in Python 3.2 this is not the same as
builtins.hasattr(), it swallows any exception (do you think this is a
bug in core Python?). I'm inclined to fix the behavior for ALL Python
versions to suppress only AttributeError.

-- 
Lisandro Dalcin
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