[issue20041] TypeError when f_trace is None and tracing.

[Xavier de Gaye]

Xavier de Gaye added the comment:

This patch fixes the TypeError.
New issue 27218: improve tracing performance with f_trace set to Py_None.

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Added file: http://bugs.python.org/file43198/none_f_trace.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20041>
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