fixed the bug caused by a call to objs_from_sth without dest_slice
fixed the bug caused by a call to objs_from_sth without dest_slice

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