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

def _add_gmaf(self, variant_obj, info_dict):
        """Add the gmaf frequency
        
        Args:
            variant_obj (puzzle.models.Variant)
            info_dict (dict): A info dictionary
        
        """
        ##TODO search for max freq in info dict
        for transcript in variant_obj.transcripts:
            gmaf_raw = transcript.GMAF
            if gmaf_raw:
                gmaf = float(gmaf_raw.split(':')[-1])
                variant_obj.add_frequency('GMAF', gmaf)
                
                if not variant_obj.thousand_g:
                    variant_obj.thousand_g = gmaf