Handle empty arrays

[bidoubiwa]

When providing an empty array a trailing coma is added after the write. This, even if nothing has been written.

It can be handled using turbo-json -checker that could return an empty array type. Which is not the prefered method as it adds features not related to the original use case of the library.

The other possibility is to bring the reader to the first nom white space non closing bracket character when the root type of the json file is an array