Do not die if ENSEMBL_HOMOEOLOGUES is not defined
Resilience against missing taxa
bugfix 2nd edition: do not pester about ENSEMBL_HOMOEOLOGUES
get_Transcript() was not working for ENSEMBLTRANS
There are foreign keys there, so DELETE FROM is advised
Merge branch 'release/75'

* release/75:
  There are foreign keys there, so DELETE FROM is advised
  get_Transcript() was not working for ENSEMBLTRANS
  bugfix 2nd edition: do not pester about ENSEMBL_HOMOEOLOGUES
  Resilience against missing taxa
  Do not die if ENSEMBL_HOMOEOLOGUES is not defined

Conflicts:
	modules/Bio/EnsEMBL/Compara/DBSQL/SpeciesTreeNodeAdaptor.pm