Ability to hide tasks without a date range

[Kisty]

Would be nice to hide tasks which don't have a date attached to them. I have a hierarchy of tasks with lots of sub and sub sub tasks. Some of the tasks don't have a deadline due to nature of them (and probs should inherit the parent task date), and seem to clog up the view (can't see much of the gantt chart see #5).

A few solutions I can think of:

1. Change the date of the tasks in the chart view to the parent task.
2. Leave up to user to set deadline.
3. Add a toggle to show just tasks with dates.

I'll do 2 to workaround but if it can be done, could you point me in the right direction in how to change it?

Thanks!