function simplify(obj) {
   for (var p in obj) {
       if ('' == obj[p]) {
          delete obj[p];
       }
       if ((typeof(obj[p]) == 'object') && (obj[p].hasOwnProperty('length') && (obj[p].length == 0))) {
          delete obj[p];
       }
       if (typeof(obj[p]) == 'object') {
           obj[p] = simplify(obj[p]);
       }
       if ((null == obj[p]) || ('' == obj[p])) {
          delete obj[p];
       }
   }
   for (var t in obj) {
        return obj;
   }
   return null;
}