message: RealmBrowser: Print null values correctly
diff: @@ -54,6 +54,10 @@ void print_objects(ConstTableRef table, size_t begin, size_t end)
  for (size_t row = begin; row < end; row++) {
  printf("%5zu ", row);
  for (size_t col = 0; col < table->get_column_count(); col++) {
  + if (table->is_null(col, row)) {
  + printf(" null");
  + continue;
  + }
  switch (table->get_column_type(col)) {
  case type_Int:
  printf(" %20ld", table->get_int(col, row));
  