dashboard: improve checklist handling

dashboard/src/views/app.js

@@ -138,6 +138,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
 
     $scope.info = {
         showDoneChecklist: false,
+        hasOldChecklist: false,
 
         notes: {
             busy: false,
@@ -173,6 +174,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
         },
 
         show: function () {
+            $scope.info.hasOldChecklist = !!Object.keys($scope.app.checklist).find((k) => { return $scope.app.checklist[k].acknowledged; });
             $scope.info.notes.content = $scope.app.notes;
             $scope.info.notes.editing = false;
             $scope.info.notes.busy = false;
@@ -183,6 +185,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
 
             Client.configureApp($scope.app.id, 'checklist', { checklist: $scope.app.checklist }, function (error) {
                 if (error) return console.error('Failed to save checklist.', error);
+                $scope.info.hasOldChecklist = true;
             });
         }
     };