Defend against null error message reported by libxml2.
While this isn't really supposed to happen, it can occur in OOM
situations and perhaps others. Instead of crashing, substitute
"(no message provided)".
I didn't worry about localizing this text, since we aren't
localizing anything else here; besides, if we're on the edge of
OOM, it's unlikely gettext() would work.
Report and fix by Sergio Conde Gómez in bug #15624.
Discussion: https://postgr.es/m/15624-4dea54091a2864e6@postgresql.org
Branch
------
REL9_5_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/7821a4d60ed677ce19646383a2fc2e9e56319d5f
Modified Files
--------------
src/backend/utils/adt/xml.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
