Return a specific variant.

            We solve this by building a gemini query and send it to _variants

            Args:
                case_id (str): Path to a gemini database
                variant_id (int): A gemini variant id

            Returns:
                variant_obj (dict): A puzzle variant

def variant(self, case_id, variant_id):
        """Return a specific variant.

            We solve this by building a gemini query and send it to _variants

            Args:
                case_id (str): Path to a gemini database
                variant_id (int): A gemini variant id

            Returns:
                variant_obj (dict): A puzzle variant

        """
        #Use the gemini id for fast lookup
        variant_id = int(variant_id)
        gemini_query = "SELECT * from variants WHERE variant_id = {0}".format(
            variant_id
        )

        individuals = []
        # Get the individuals for the case
        case_obj = self.case(case_id)
        for individual in case_obj.individuals:
            individuals.append(individual)

        self.db = case_obj.variant_source
        self.variant_type = case_obj.variant_type

        gq = GeminiQuery(self.db)
        gq.run(gemini_query)

        for gemini_variant in gq:
            variant = self._format_variant(
                case_id=case_id,
                gemini_variant=gemini_variant,
                individual_objs=individuals,
                index=gemini_variant['variant_id'],
                add_all_info = True
            )
            return variant

        return None