Be a little bit more careful about using sqlstate, in case libpq returned

Peter Eisentraut <peter_e@gmx.net>

Commit: e39bc695d683dcd6ae376d38e9acb91ae37642de
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2003-08-08T13:16:20Z
Releases: 7.4.1
Be a little bit more careful about using sqlstate, in case libpq returned
NULL for it.

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