Log Message:
-----------
Adjust pg_proc.proargtypes[0] tests in psql \df to handle new NULL value
for a function taking no arguments, per report from Michael Fuhr.
Modified Files:
--------------
pgsql/src/bin/psql:
describe.c (r1.113 -> r1.114)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c.diff?r1=1.113&r2=1.114)