empty_string_if_nil.lua

return function (...)
  local result = {}
  local args, args_count = {...}, select('#', ...)
  for i = 1, args_count do
    item = args[i]
    if item == nil then
      table.insert(result, '')
    else
      table.insert(result, item)
    end
  end

  return unpack(result)
end