Allow editing metadata in item-detail

modules/webapp/src/main/elm/Comp/Dropdown.elm

@@ -9,6 +9,7 @@ module Comp.Dropdown exposing
     , makeSingle
     , makeSingleList
     , mkOption
+    , notSelected
     , setMkOption
     , update
     , view
@@ -155,6 +156,11 @@ getSelected model =
     List.map .value model.selected
 
 
+notSelected : Model a -> Bool
+notSelected model =
+    getSelected model |> List.isEmpty
+
+
 type Msg a
     = SetOptions (List a)
     | SetSelection (List a)