drive-menu: Include eject buttons for unmounted/empty optical drives
The eject/unmount buttons in the menu are great, but I don't see a way to eject an empty optical drive. Would it be possible to include those in the list, if they support ejecting while empty? (I think most tray-loading drives support that, but I assume most slot-loading drives don't. Not sure about top-loading, though I don't think they're common in computer parts. Also not sure if there's a way to tell if ejection is possible in software.)