Hobo/hobo — pull request #46 by tacid (2013-10-29 18:44:01+00:00)
Title: Update model.rb

сhange `parse_sort_param` has to check for `db_sort_field.empty?` not just `db_sort_field`

`db_sort_field` is *String* (.to_s), so if we want condition to has any sense we should to check for `empty?` string, because any *String* (even "") will evaluete as true.