In _list_dbIDs():
In _list_dbIDs():

When called by list_stable_ids() (in e.g. GeneAdaptor) and we're dealing
with a multi-species database, we need to also join with the base
feature table since the stable_id tables do not have seq_region_ids.

Solves a problem raised on the dev list.

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