Add "unassigned" info on roadmaps

You can currently hide specific statuses from the roadmap. As a first time user I was confused that new feedback that I explicitly assigned to that roadmap wasn't showing. Only later did I realize the default status "Open" is not shown as a roadmap column by default. Maybe add some info/list/popup on the roadmap page at least for admins that shows feedback that is assigned to the roadmap, but not in a visible column.