check len of unioned_df not data_df
check len of unioned_df not data_df

unicef/polio,SeedScientific/polio,unicef/rhizome,unicef/rhizome,SeedScientific/polio,unicef/rhizome,unicef/polio,SeedScientific/polio,unicef/polio,SeedScientific/polio,SeedScientific/polio,unicef/rhizome,unicef/polio