Space in empty parentheses

I'd like an option to disable space in empty parens as a modifier to "space-in-paren" option.

### Example

#### code with "--space-in-paren"

```JavaScript
if ( foo ) {
    bar;
}

var baz = function ( ) {};
```

#### code with "--space-in-paren" without space in empty parens

```JavaScript
if ( foo ) {
    bar;
}

var baz = function () {}; // no space inside function parens
```