Log Message:
-----------
Don't convert debug/notice/warning messages into errors just because
they occur inside error processing. This is a back-port of a logic
change already present in 8.0. Partial fix for bug#1976 --- doesn't
cure the wrong-encoding problem, but at least stops it from causing
unintended ERRORs.

Tags:
----
REL7_4_STABLE

Modified Files:
--------------
pgsql/src/backend/utils/error:
elog.c (r1.125.2.1 -> r1.125.2.2)
(http://developer.postgresql.org/cvsw...1&r2=1.125.2.2)

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