Use of \bar at start of music leads to warning

[David Kastrup]

Apart from the bar not appearing (arguably wrong for a manually
specified bar even at the start of music), we get the warning

warning: cannot find or create `Timing' called `'

for the following input:

{ \bar "||" c' c' c' c' }

Putting \new Voice before this makes the warning disappear (but does not
let the bar appear, likely an unrelated problem).

-- 
David Kastrup