[issue26407] csv.writer.writerows masks exceptions from __iter__

[Terry J. Reedy]

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


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stage: patch review -> commit review
versions:  -Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26407>
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