fixes #63

[trullock]

I'm not entirely sure if the outputted javascript is exactly "right", but given we're parsing mangled input markup I'm not sure what to do.

1. This fixes the infinite loop, which even if the outputted JS is "wrong" at least it doesnt crash/hang
2. What is NUglify's stance on handling bad input syntax - do we care, as long as errors are reported? Do we not output anything at all? Do we not output the mangled statement, and resume at the next good bit? This PR outputs something from the mangled input