code: public boolean unloadView(Category category) {
      if (views.remove(category) == null | presenters.remove(category) == null) {
        LOGGER.info("Category " + category.getDescription() + " doesn't exist!");
        return false;
      } else {
        return true;
      }
    }
docs: Unloads a view / presenter pair from the HashMaps.
  This method can be used in case a view / presenter pair needs to be reloaded.
  
  @param category of the view / presenter pair to be unloaded.
  @return true if the view and presenter were unloaded and false if view doesn't exist.