OZG-165 check apiRoot resource before loading vorgangList

goofy-client/libs/vorgang-shared/src/lib/vorgang.service.spec.ts

@@ -123,6 +123,19 @@ describe('VorgangService', () => {
 				expect((<any>service).hasNextPage$.value).toBe(false);
 			})
 		})
+
+		describe('load currentVorgangList with empty ApiRoot resource', () => {
+
+			beforeEach(() => {
+				(<any>apiRootService).getApiRoot.mockReturnValue(of(createEmptyStateResource()));
+			})
+
+			it('should not call repository loadVorgangList', () => {
+				service.getCurrentVorgangList();
+
+				expect(repository.loadVorgangList).not.toHaveBeenCalled();
+			})
+		})
 	})
 
 	describe('load next page', () => {

goofy-client/libs/vorgang-shared/src/lib/vorgang.service.ts

@@ -4,10 +4,10 @@ import { createEmptyStateResource, createStateResource, doIfLoadingRequired, Nav
 import { getEmbeddedResource, hasLink } from '@ngxp/rest';
 import { ApiRootService } from 'libs/api-root-shared/src/lib/api-root.service';
 import { BehaviorSubject, Observable, Subscription } from 'rxjs';
+import { first } from 'rxjs/operators';
 import { VorgangListLinkRel } from './vorgang.linkrels';
 import { VorgangListResource, VorgangMitEingangResource, VorgangResource } from './vorgang.model';
 import { VorgangRepository } from './vorgang.repository';
-import { first } from 'rxjs/operators';
 
 @Injectable()
 export class VorgangService {
@@ -49,11 +49,15 @@ export class VorgangService {
 	public getCurrentVorgangList(): Observable<StateResource<VorgangListResource>> {
 		doIfLoadingRequired(this.currentList$.value, () => this.apiRootService.getApiRoot().pipe(first())
 			.subscribe(apiRoot => {
-				this.loadVorgangList(apiRoot.resource)
+				if (this.isResourceLoaded(apiRoot)) this.loadVorgangList(apiRoot.resource)
 			}));
 		return this.currentList$;
 	}
 
+	private isResourceLoaded(apiRoot: StateResource<ApiRootResource>): boolean {
+		return apiRoot.resource != null;
+	}
+
 	public loadNextPage(): void {
 		if (!this.isCurrenListResourceLoading()) {
 			this.loadNextListPage();