View epics that don't fit the current timeline on the roadmap at the bottom
Currently, if an epic does not "fit" on the current timeline, it is not shown on the roadmap. This can be because:
The epic does not have dates.
The epic period (i.e. from start to end) does not fit the current timeline view. For example, if the epic starts in year 3000 CE, but it is currently 2018, then currently it won't show up because it is too far in the future.
However, this is not great in some circumstances. For the product team, it would be great to see epics still on the roadmap, even though they don't fit on the roadmap. So that if we care about an epic and want to show it on the same roadmap view, we can still do so, even before we have put dates on it.
There is some FE/UX difficulty potentially when changing views/scrolling. But these should be addressed in &311 (closed)