code: function removeBlankAttributes(obj) {
    return foldl(function(results, val, key) {
      if (val !== null && val !== undefined) results[key] = val;
      return results;
    }, {}, obj);
  }
docs: Filters null/undefined values from an object, returning a new object.
  
  @api private
  @param {Object} obj
  @return {Object}