OZG-7473 revert change

Based on CR comment.

alfa-client/libs/test-utils/src/lib/helper.ts

@@ -26,8 +26,8 @@ import { ComponentFixture } from '@angular/core/testing';
 import { By } from '@angular/platform-browser';
 import { EventData } from './model';
 
-export function getElementFromFixtureByType<T>(fixture: ComponentFixture<any>, component: Type<T>): T | null {
-  return getDebugElementFromFixtureByType(fixture, component)?.componentInstance as T;
+export function getElementFromFixtureByType<T>(fixture: ComponentFixture<any>, component: Type<T>): T {
+  return getDebugElementFromFixtureByType(fixture, component).componentInstance as T;
 }
 
 function getDebugElementFromFixtureByType<T>(fixture: ComponentFixture<any>, component: Type<T>): DebugElement {