[issue15916] change doctest DocTestSuite not to raise ValueError if no docstrings

[Roundup Robot]

Roundup Robot added the comment:

New changeset 57fb5441a4aa by R David Murray in branch 'default':
#15916: if there are no docstrings, make empty suite, not an error.
http://hg.python.org/cpython/rev/57fb5441a4aa

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nosy: +python-dev

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