do not die but just give warning if accession not found
do not die but just give warning if accession not found

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