Painless: Should } be a delimiter?

I'm porting reindex's tests from groovy to painless. Yay. One thing I found is that a statement like

```
if (ctx._source.bar != 1) {ctx._source.foo = 1}
```

doesn't compile. It needs to be

```
if (ctx._source.bar != 1) {ctx._source.foo = 1;}
```

with the semicolon between the `1` and the `}`.

Is it worth making that work?
