Task group

I should like to make task group in the task tree without start and end date.
But the code is wrong without start_date.
What is the nice code?
The code:
var users_data = {
data: [
{ “id”: 1, “text”: “Task Group”, “order”: “1”, “parent”: “”, open: true, “Kezdes”: “”, “Befejezes”: “” },

Current version still doesn’t support such use-case
But we will restore it in the final version.