I think @gdusbabek wanted to say that can avoid calling "decode" for empty column values.

So something like:

```javascript

if (row.columns[i].value === null || row.columns[i].value === '') {
  decodedValue = row.columns[i].value;
}
else {
  decodedValue = decoder.decode(row.columns[i].value, 'validator', row.columns[i].name);
}
...
```

@gdusbabek am I right?