refactor: clean code

src/api/api.service.ts

@@ -1,4 +1,4 @@
-import {catchError, filter, mergeMap, Observable, retryWhen, switchMap, take, tap, timer} from "rxjs";
+import {catchError, filter, mergeMap, Observable, retryWhen, switchMap, tap, timer} from "rxjs";
 import {HttpClient, HttpErrorResponse} from "@angular/common/http";
 import {NotifyColor, OpenNotifyService} from "@service/open-notify.service";
 import {environment} from "@environment";
@@ -144,7 +144,7 @@ export default abstract class ApiService implements SetRequestBuilderAfterBuild
 
   private handleError(error: HttpErrorResponse): void {
     // todo: change to Retry-After condition
-    if (error.error.toString().includes("setup")) {
+    if (error.error && error.error.toString().includes("setup")) {
       this.router.navigate(['/setup/']).then();
       return;
     }

src/api/v1/faculty.service.ts

@@ -13,7 +13,6 @@ export class FacultyService extends ApiService {
       .setQueryParams({page: page, pageSize: pageSize})
       .build<ApiService>()
       .get<FacultyResponse[]>();
-
   }
 
   public getById(id: number) {