return on first error to avoid writing invalid bytes

[jdiamond]

I added return to all the lines that emit error events. This stops writing bytes to the output stream that we know are invalid.

[mcollina]

Thanks @jdiamond! We should return either true or false. stream.emit('error') returns the streams, which is truthy, and that might cause issues. I think we should return false.

[mcollina]

Perfect, thanks!