[issue31522] _mboxMMDF.get_string() fails to pass param to get_bytes()

[Cheryl Sabella]

Change by Cheryl Sabella <cheryl.sabella at gmail.com>:


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versions: +Python 3.8 -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31522>
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