Fix "Fatal Python error: UNREF invalid object" in debug builds #1936
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PyObject_Del() should only be called on the self object in a dealloc call, not after failing to make a new object. Replace with Py_DECREF, which eventually calls PyObject_Del()
http://bugs.python.org/issue3299#msg78740
https://mail.python.org/pipermail/python-dev/2003-February/033258.html