If I didn't select due date, biggantt do this for me and made me upset

[vidoq]

So the problem is, all issues has due dates, even if assignee\author didn't select due date.
It changes to now() automatically by biggantt

I know that in plugin settings I set:

end date = jira.due date

if I choose
end date = customfield[end date] biggantt created

problem will be solved, but another one will arise, in this situation, when I change due date in issue, it won't be automatically updated on gantt chart and vice versa, if I made changes on biggantt chart (dependencies or moving back and forth), in issue due date won't be automatically changed.

So, I need:
1. if due date field empty = it should be empty from now on before it will be filled by assignee or author

2. if due date field has date = it should be automatically updated if some changes made on biggantt chart!

How can I do it?
Can it be solved by right settings of biggantt plugin or should I use scriptrunner or other automation script plugins? Who has script example?

[Tomek-SoftwarePlant]

Hi, 

With Start date/Due Date task period mapping, BigGantt uses these fields' values to display task bars. So, even if a task has Due Date empty, BigGantt will populate it in order to mark that task's end on a Gantt's timeline. 

So, as far as BigGantt's settings, there's nothing else to be configured to meet your requirements, sorry. 

Best,
Tomek