function getNextSortOrder(sortOrder) {
  if (sortOrder === DESC_SORT_STATE) {
    return;
  } else if (sortOrder === ASC_SORT_STATE) {
    return DESC_SORT_STATE;
  }

  return ASC_SORT_STATE;
}
Get next sort order for particular column. The order sequence looks as follows: 'asc' -> 'desc' -> undefined -> 'asc'

@param {String|undefined} sortOrder sort order (`asc` for ascending, `desc` for descending and undefined for not sorted).
@returns {String|undefined} Next sort order (`asc` for ascending, `desc` for descending and undefined for not sorted).