Display Milestones without a due date as active
Created by: jameswritescode
Milestones appear to currently set due_date as NULL in the milestones table if you do not specifically pick a date in the calendar on milestone creation.
This small change would make due_date optional and show milestones without a due_date set in the active tab rather then only show them in the ALL view.
This is the first time I've done a pull request on github, as small as this might be, let me know if I've done anything wrong.
Thanks.