docs: def is_active(feature):
    """ Check if a feature is active """
  
    if current_app:
      feature_flagger = current_app.extensions.get(EXTENSION_NAME)
      if feature_flagger:
        return feature_flagger.check(feature)
      else:
        raise AssertionError("Oops. This application doesn't have the Flask-FeatureFlag extention installed.")
  
    else:
      log.warn(u"Got a request to check for {feature} but we're running outside the request context. Check your setup. Returning False".format(feature=feature))
      return False