[issue5633] fix for timeit when the statement is a string and the setup is not (and tests)

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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assignee:  -> serhiy.storchaka
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5633>
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