Log Message:
-----------
Fix a couple of places that were assuming debug_query_string couldn't
be NULL ... seems an unsafe assumption.
Modified Files:
--------------
pgsql/contrib/dblink:
dblink.c (r1.59 -> r1.60)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/dblink/dblink.c.diff?r1=1.59&r2=1.60)
pgsql/src/backend/commands:
portalcmds.c (r1.56 -> r1.57)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/portalcmds.c.diff?r1=1.56&r2=1.57)