private void checkViewAlreadySetted() {
    if (view == null) {
      throw new IllegalArgumentException("Remember to set a view for this presenter");
    }
  }
Use GetTvShows interactor to obtain a collection of videos and render it using the view
object setted previously. If the interactor returns an error the presenter will show an error
message and the empty case. In both cases, the progress bar visibility will be hidden.
app/src/main/java/com/github/pedrovgs/effectiveandroidui/ui/presenter/TvShowCatalogPresenter.java