Some empty "" chords may be causing trouble with Jenkins. Jenkins builds are stalling when generating PDFs for some morris tunes. I suspect the problem may be an empty chord "" and abc2abc's attempt to transpose it. I've been meaning to remove the chords from the horn output, because abc2abc transposes them too, which renders them not terribly useful. So get on and do it. Also remove "" from the morris tunes where it occurs.

X:1
T:Staffordshire Hornpipe, The
M:C
L:1/8
S:Flamborough
K:Gmaj
(3DEF |\
G2e2 c2AG | FAd2 B2A2 | G2e2 c2AG | FAd2 DFAF | G2e2 c2AG |
FAd2 B2G2 | cedc BGAF | G2B2 G2 :|\
|: z2 | B2A2 G2F2 | EF (3GFE D2 EF | GFGA BABc |
 d2c2 A2d2 | B2A2 G2F2 | EF (3GFE D2d2 | e2dc BGAF | G2B2 G2 :|