[issue33851] 3.7 regression: ast.get_docstring() for a node that lacks a docstring

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +inada.naoki

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33851>
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