[issue36598] mock side_effect should be checked for iterable not callable

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +xtreak
versions: +Python 3.8 -Python 2.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36598>
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