message: fix(ivy): don't crash in listLazyRoutes()
  This commit replaces the "not implemented" error when calling
  listLazyRoutes() with an empty result, which will allow testing
  in the CLI before listLazyRoutes() is implemented.
  PR Close
diff: @@ -82,9 +82,7 @@ export class NgtscProgram implements api.Program {
  .filter((result): result is Promise<void> => result !== undefined));
  }
  - listLazyRoutes(entryRoute?: string|undefined): api.LazyRoute[] {
  - throw new Error('Method not implemented.');
  - }
  + listLazyRoutes(entryRoute?: string|undefined): api.LazyRoute[] { return []; }
  getLibrarySummaries(): Map<string, api.LibrarySummary> {
  throw new Error('Method not implemented.');
  