fixed fetch_all_by_feature_class bug
fixed fetch_all_by_feature_class bug

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