Less 1.4.2 version is causing empty comments generated before the correct ones

[spierobi]

I've just upgraded from 1.3.3 to 1.4.2.
The CSS resulted from compiling with the new version has some incorrect/empty extra comments generated, compared with the old version.

I've attached an image to show the difference between the code generated with the old and new version:

[asual]

Can you please do a quick check about this behavior with the original nodejs version? I don't think this project is doing anything special in this regard.