def METHOD_NAME(self, _):
    """
    Show the list of preset queries if not index is provided by the user
    else perform the query and return the results.
    """
    query = self.preset_queries_wdg.value
    collection = self.mng_connector.get_collection()
    if query is None:
        return QueryResults.empty_from_query({})
    query = json.loads(query)
    qr = self.flow_model_cls.mng_find(query, collection, limit=self.limit)
    return qr