Initial whitespace in .jss files causes headers to be sent

[tmalaher]

This is a minor quibble, and easily fixed on the user side, but it's something that tripped me up.

I tried my first script by pasting the sample code from the web page into a file, and ended up with leading whitespace before the <?. This worked fine.

Later, I tried to override the content type by setting response.headers['content-type']='text/plain'; (or text/json or whatever.

But since the initial whitespace had already been sent with write, the sendHeaders function had already been called, so my change to the headers was "too late".

The write method could be modified to ignore a write that consists entirely of whitespace while isHeaderSent is false.