Empty parens will never contain space, ref #320

space-in-paren setting up until now formatted empty parens with space in
them:

    function ( ) {
        foo( ).bar( a + 1)
    }

Now it skips this space for greater readability and prettier code.

    function () {
        foo().bar( a + 1 )
    }

If you have a good use case for the old behavior, open the issue, I
couldn't find any reason for that.