[issue35379] IDLE's close fails when io.filename set to None

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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components: +macOS
nosy: +ned.deily, ronaldoussoren
versions: +Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35379>
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