application: make entry optional when possible
If the user want to process a .nx file and if this file contains only one entry for now if the entry is not provided this will raise an Error.
It would be wiser to open the only existing entry.
If the user want to process a .nx file and if this file contains only one entry for now if the entry is not provided this will raise an Error.
It would be wiser to open the only existing entry.