def bestName(inRow):
    """ 
    helper function for annotate_best_CDS
    given a row with 'Label' and 'Locus tag', choose the best annotation
    choose 'Label' if it's present
    otherwise choose 'Locus tag'
    return a string with the best name
    """
    if inRow['Label'] == '':
        result = inRow['Locus Tag']
    else:
        result = inRow['Label']
        
    return result