Fix fetch_by_external_name
Fix fetch_by_external_name

at7/ensembl,muffato/ensembl,danstaines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,willmclaren/ensembl,muffato/ensembl,mjg17/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,mjg17/ensembl,muffato/ensembl,muffato/ensembl,james-monkeyshines/ensembl,at7/ensembl,at7/ensembl,willmclaren/ensembl,mjg17/ensembl,Ensembl/ensembl,at7/ensembl,danstaines/ensembl