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)

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