def add_source_to_description(row):
    if (not pd.isna(row['Source'])):
        return ((row['SourceNote'] + ' ') + str(row['Source']))
    else:
        return row['SourceNote']
def add_source_to_description(row):
    if (not pd.isna(row['Source'])):
        return ((row['SourceNote'] + ' ') + str(row['Source']))
    else:
        return row['SourceNote']