Add the genes for a variant

        Get the hgnc symbols from all transcripts and add them
        to the variant.

        Args:
            variant (dict): A variant dictionary

        Returns:
            genes (list): A list of Genes

def _get_genes(self, variant):
        """Add the genes for a variant

        Get the hgnc symbols from all transcripts and add them
        to the variant.

        Args:
            variant (dict): A variant dictionary

        Returns:
            genes (list): A list of Genes
        """
        transcripts = variant['transcripts']
        ensembl_ids = [transcript['ensembl_id'] for transcript in
                       transcripts if transcript['ensembl_id']]
        hgnc_symbols = [transcript['hgnc_symbol'] for transcript in
                        transcripts if transcript['hgnc_symbol']]
        genes = get_gene_info(ensembl_ids, hgnc_symbols)
        return genes