message: refactor(router): remove unnecesary `null`
  These null values are unused and unecessary. I suspect it's a remnant from when the codebase was transpiled to Dart.
  PR Close
diff: @@ -290,7 +290,7 @@ export function withEnabledBlockingInitialNavigation(): EnabledBlockingInitialNa
  deps: [Injector],
  useFactory: (injector: Injector) => {
  const locationInitialized: Promise<any> =
  - injector.get(LOCATION_INITIALIZED, Promise.resolve(null));
  + injector.get(LOCATION_INITIALIZED, Promise.resolve());
  let initNavigation = false;
  /**
  