[issue1615] PyObject_GenericGetAttr suppresses AttributeErrors in descriptors

[Ethan Furman]

Changes by Ethan Furman <ethan at stoneleaf.us>:


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stage: needs patch -> test needed
versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1615>
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