[issue20041] TypeError when f_trace is None and tracing.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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assignee:  -> serhiy.storchaka
stage: patch review -> commit review
versions: +Python 3.5, Python 3.6 -Python 3.3, Python 3.4

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<http://bugs.python.org/issue20041>
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