undo fix to already fixed method

modules/Bio/EnsEMBL/Transcript.pm

@@ -1156,7 +1156,6 @@ sub five_prime_utr {
   my $self = shift;
 
   my $seq = substr($self->spliced_seq, 0, $self->cdna_coding_start - 1);
-  CORE::length($seq) or return;
 
   return undef if(!$seq);
 
@@ -1171,7 +1170,6 @@ sub three_prime_utr {
   my $self = shift;
 
   my $seq = substr($self->spliced_seq, $self->cdna_coding_end);
-  CORE::length($seq) or return;
 
   return undef if(!$seq);