to_conll2003 function returns [ ] when annotations array is blank.

[jdixosnd]

trying with following text string, {"id": 2580, "text": "RUGBY UNION - CUTTITTA BACK FOR ITALY AFTER A YEAR .\nROME 1996-12-06\nItaly recalled Marcello Cuttitta", "annotations": []}

the output is a blank array, it should give output with 'O' for all entity type.

[tolgayan]

I have the same issue.