Comment 5 for bug 1374163

I've pushed a patch up to gerrit. We made a lot of changes in the Group Pages block in 15.04, so this patch won't cherry-pick cleanly to 1.10 and earlier. So I'm marking those branches "Won't Fix" because this is only a medium bug.

Keeping the priority at medium, because I don't think access start and end dates are a heavily-used feature. But nonetheless this would be a good bug to fix in 15.04.1, because it does lead to a visible error message for the user.