fixed auto-vivification bug in get_all_ExternalFeatures (spotted by pm2)
fixed auto-vivification bug in get_all_ExternalFeatures (spotted by pm2)

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