Merged changes from the branch

modules/Bio/EnsEMBL/PredictionTranscript.pm

@@ -348,7 +348,7 @@ sub get_all_Exons {
 sub get_all_translateable_Exons {
   my $self = shift;
 
-  return $self->get_all_Exons;
+  return [ grep{ ref( $_ ) eq 'Bio::EnsEMBL::Exon' } @{$self->get_all_Exons} ];
 }