[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Łukasz Langa]

Changes by Łukasz Langa <lukasz at langa.pl>:


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assignee:  -> lukasz.langa
nosy: +lukasz.langa

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1692335>
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