Add the gmaf frequency
        
        Args:
            variant_obj (puzzle.models.Variant)
            info_dict (dict): A info dictionary

def _add_exac(self, variant_obj, info_dict):
        """Add the gmaf frequency
        
        Args:
            variant_obj (puzzle.models.Variant)
            info_dict (dict): A info dictionary
        
        """
        exac = None
        exac_keys = ['ExAC', 'EXAC', 'ExACAF', 'EXACAF']
        for key in exac_keys:
            if info_dict.get(key):
                exac = float(info_dict[key])
        #If not found in vcf search transcripts
        if not exac:
            for transcript in variant_obj.transcripts:
                exac_raw = transcript.ExAC_MAF
                if exac_raw:
                    exac = float(exac_raw.split(':')[-1])
        
        if exac:
            variant_obj.add_frequency('ExAC', exac)