Log Message:
-----------
Fix bug: json_check not crash if json is null
float functions return json datatype int and int functions return datatype float
Modified Files:
--------------
postgresql-json/src:
postgres_json.c (r1.1 -> r1.2)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/jsonpath/postgresql-json/src/postgres_json.c?r1=1.1&r2=1.2)