Removed use of SeqDumper and replaced it with our own FASTASerializer.

modules/Bio/EnsEMBL/Utils/IO/FASTASerializer.pm

@@ -174,10 +174,12 @@ sub print_Seq {
     $there = $end if($there > $end); 
     my $seq = $slice->subseq($here, $there);
     $seq =~ s/(.{1,$width})/$1\n/g;
-    print $fh $seq;
+    print $fh $seq or die "Error writing to file handle";
     $here = $there + 1;
   }
   
+  if ($slice->length > 0) {$self->{'achieved_something'} = 1;}
+  
 }
 
 =head2 line_width

modules/Bio/EnsEMBL/Utils/IO/Serializer.pm

@@ -101,20 +101,6 @@ sub print_main_header {
 	warning("No writer for headers in this format. Nothing done" );
 }
 
-=head2 print_sequence 
-	Arg [1]    : Bio::EnsEMBL::Slice
-	Description: By default, prints a block of FASTA format sequence from the given slice
-    DEPRECATED - This feature is becoming FASTASerializer
-=cut
-#TODO : Remove in release 66
-sub print_sequence {
-	my $self = shift;
-	my $slice = shift;
-	my $fh = $self->{'filehandle'};
-	Bio::EnsEMBL::Utils::SeqDumper->dump_fasta( $slice, $fh);
-	$self->{'achieved_something'} = 1;
-}
-
 =head2 printed_something
     Description: Check if serializer has printed any useful data. Not accurate with FASTA
                  due to non-reporting dumper.