[issue18772] Fix gdb plugin for new sets dummy object

[Antoine Pitrou]

Antoine Pitrou added the comment:

See also the python-dev thread about other drawbacks of the new dummy approach: http://mail.python.org/pipermail/python-dev/2013-August/128025.html

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18772>
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