[issue29686] Unittest - Return empty string instead of None object on shortDescription()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This can break a code that checks whether shortDescription() is None.

If you an empty string rather than None, just use the expression `shortDescription() or ''`.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue29686>
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