Bugfix in fetch_all_synonyms():
Bugfix in fetch_all_synonyms():

  If there are no synonyms, return an empty list, not a list containing
  a reference to an empty list.

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