Fix comment

src/views/app.js

@@ -1169,7 +1169,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
             case ISTATES.PENDING_DEBUG:
             case ISTATES.PENDING_RECREATE_CONTAINER:
             case ISTATES.PENDING_CONFIGURE:
-            case ISTATES.PENDING_BACKUP: // only here for completeness, should never happen as this only set task error and not app erro
+            case ISTATES.PENDING_BACKUP: // can happen if the backup task was killed/rebooted
             case ISTATES.PENDING_UPDATE: // when update failed, just bring it back to current state and user can click update again
             default:
                 repairFunc = Client.repairApp.bind(null, $scope.app.id, {});