Fix empty statement in the transformer

[imteekay]

Looking at how the compiler emits the statements, we should not exclude it from the final js output

This code

var singleQuote = 'singleQuote';;var doubleQuote = "doubleQuote";

Generates this output:

"use strict";
var singleQuote = 'singleQuote';
;
var doubleQuote = "doubleQuote";