TS linting changes

src/main/webapp/app/exercise/import/exercise-import.component.ts

@@ -170,7 +170,7 @@ export class ExerciseImportComponent implements OnInit {
    */
   isDifficulty(difficulty: string) {
     if (this.exerciseInfo!.difficulty !== undefined) {
-      return this.exerciseInfo!.difficulty!.toLowerCase() === difficulty.toLowerCase();
+      return this.exerciseInfo!.difficulty.toLowerCase() === difficulty.toLowerCase();
     } else {
       return false;
     }

src/main/webapp/app/exercise/import/exercise-import.route.ts

@@ -8,7 +8,7 @@ export const EXERCISE_IMPORT_ROUTE: Routes = [
     path: ':token',
     component: ExerciseImportComponent,
     data: {
-      //      authorities: [Authority.USER],
+      authorities: [Authority.USER],
       pageTitle: 'exercise.import.pageTitle',
     },
     canActivate: [UserRouteAccessService],