Обсуждение: pgsql: Fix incorrect tests for undef Perl values in some places in

Log Message:
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Fix incorrect tests for undef Perl values in some places in plperl.c.
The correct test for defined-ness is SvOK(sv), not anything involving
SvTYPE.  Per bug #3415 from Matt Taylor.
Back-patch as far as 8.0; no apparent problem in 7.x.

Tags:
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REL8_2_STABLE

Modified Files:
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    pgsql/src/pl/plperl:
        plperl.c (r1.123 -> r1.123.2.1)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/plperl.c.diff?r1=1.123&r2=1.123.2.1)