"undefined" chained with Buffer data

[rlopmar]

https://github.com/sapmentors/cap-community/blob/c5ac508d41d91895cea74fa38dcc09d73c3b565b/examples/media-handling/srv/media-service.js#L18

Hi, in the media-service example, if we save the Buffer chunks like in the mentioned line 18, the Buffer data gets concatenated with an "undefined" string (please check the image).

This can be solved changing that line with content ? (content += dataChunk) : (content = dataChunk);