[issue20026] sqlite: handle correctly invalid isolation_level

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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assignee:  -> haypo
components: +Library (Lib)
nosy: +serhiy.storchaka
stage:  -> commit review
type:  -> crash

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20026>
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