pgsql: Return NULL from json_object_agg if it gets no rows.

Return NULL from json_object_agg if it gets no rows.

This makes it consistent with the docs and with all other builtin
aggregates apart from count().

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/ecacbdbcee67e202cfcaa1180da170b9f13654bb

Modified Files
--------------
src/backend/utils/adt/json.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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