Fix for subseq of sequence on small seq_regions (< 250k) which was

failing because it was requesting a sub slice which was longer than
the seq_region in the new caching code

modules/Bio/EnsEMBL/RepeatMaskedSlice.pm

@@ -279,8 +279,13 @@ sub subseq {
 
   my $repeats = [];
 
-  my $subslice = $seq_region_slice->sub_Slice( ($block_min << $BLOCK_PWR)+1,
-						(($block_max+1)<<$BLOCK_PWR ));
+  my $sub_start = ($block_min << $BLOCK_PWR)+1;
+  my $sub_end = ($block_max+1)<<$BLOCK_PWR;
+  if ($sub_end > $seq_region_slice->length) {
+    $sub_end =  $seq_region_slice->length ;
+  }
+
+  my $subslice = $seq_region_slice->sub_Slice( $sub_start, $sub_end);
 
   foreach my $l (@$logic_names) {
     push @{$repeats}, @{$subslice->get_all_RepeatFeatures($l)};