code: function (index, range) {
          var recs = this.getRecords(index,range);
          for (var i = 0; i < range; ++i) {
              if (typeof recs[i] === 'undefined') {
                  return false;
              }
          }
          return true;
      }
docs: Returns a boolean indicating whether Records exist in the RecordSet at the
  specified index range.  Returns true if and only if a Record exists at each
  index in the range.
  @method hasRecords
  @param index
  @param range
  @return {Boolean} true if all indices are populated in the RecordSet