Unassigned bug + obsolete patches is still generating a "Unassigned bug with patches attached" warning below the attachments section.
See bug 1193196 as an example. Previously, Jared was assigned the bug and had attached some patches. Those patches are now marked obsolete and the bug is unassigned (no assignee, state is NEW). Shouldn't be any need for a warning now.
98503a6..397050b master -> master