Add a missing $sth->finish

modules/Bio/EnsEMBL/DBSQL/BaseMetaContainer.pm

@@ -103,6 +103,7 @@ sub list_value_by_key {
   while( my $arrRef = $sth->fetchrow_arrayref() ) {
     push( @result, $arrRef->[0] );
   }
+  $sth->finish();
   $self->{'cache'}->{$key} = \@result;
 
   return \@result;

modules/Bio/EnsEMBL/DBSQL/SliceAdaptor.pm

@@ -1493,6 +1493,7 @@ sub _build_exception_cache {
     $hash{$result[0]} ||= [];
     push(@{$hash{$result[0]}}, \@result);
   }
+  $sth->finish();
 
   return;
 }