[issue26801] Fix shutil.get_terminal_size() to catch AttributeError

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov at gmail.com>:


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nosy: +larry, ned.deily
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26801>
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