'Is there a way to write this function without returning a undefined

I'm using angular fire to read data on firestore based on the logged in user. I check that the user object has been returned, and based on this I have a command to listen to document changes.

async getUsersCards() {
  let _user: UserModel = await this.authService.GetUser();

  if (_user) {
    return this.angularFirestore
      .collection<Card>('cards', (ref) =>
        ref.where('owner', '==', _user?.uid)
      )
      .valueChanges();
  } else {
  }
}

Because I have a If check on the user, the signature of the function is Promise<Observable<board[]> | undefined> how do I remove the need for the undefined (what do I do in the else block ) ?

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'Is there a way to write this function without returning a undefined

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