[issue21548] pydoc -k IndexError on empty docstring

[Terry J. Reedy]

Terry J. Reedy added the comment:

Replacing 2061 with the following should work for all versions.
desc = module.__doc__.splitlines()[0] if module.__doc__ else ''

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nosy: +terry.reedy
type:  -> behavior
versions: +Python 2.7, Python 3.5

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