vendor/ember-leaflet-cartodb/cartodb_noleaflet.js
function(index, columnName) {
      var r = this.at(index);
      if(!r) {
        return null;
      }
      return r.get(columnName);
    }
function(index, columnName) {
      var r = this.at(index);
      if(!r) {
        return null;
      }
      return r.get(columnName);
    }
function ( index , columnName ) { var r = this . at ( index ) ; if ( ! r ) { return null ; } return r . get ( columnName ) ; }
get value for row index and columnName
get value for row index and columnName