Remove comment that belongs into the commit history

Unfortunately, I cannot put it back there, but then, the comments
I just removed are in the original commit that adds this code. Good
enough.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Let FileUtils.listContents(URL) be graceful with non-existing directories

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>