Disable beaming for single note

[Nick Payne]

I had a couple of instances where I wanted two eighth notes not to be 
beamed. As a quick attempt to avoid having to use \autoBeamOff and 
\autoBeamOn for a couple of notes, I tried putting an empty pair of 
brackets after the first eighth note. This stopped the notes being 
beamed, but it also turned the first stem into a T. I have no idea 
whether this is considered an error on my part or a problem with 
Lilypond. The console log didn't indicate any error in the input:

\version "2.17.12"

\relative c' {
  c8[] c
}

test.png
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