code: function(name) {
  			var val = this.get(name);
  			if (typeof val === 'undefined' || val === null || val === '')  {
  				return null;
  			}
  
  			val = val.split(',').map(utils.trim);
  			if (!val.length) {
  				return null;
  			}
  			
  			return val;
  		}
docs: Returns comma-separated preference value as array of values
  @param {String} name
  @returns {Array} Returns <code>undefined</code> if preference is
  not defined, <code>null</code> if string cannot be converted to array