writeStream doesn't handle empty stream properly.

[shileiyu]

var inStream = self.gfs.createWriteStream(options);
inStream.on('close', function(file) {
    console.log('never happened if content is an empty stream').
});
content.pipe(inStream);

[Reggino]

Your sample code doesn't show what content exactly is in this case, or what is done with it.

Please provide a unit test describing the exact issue.