zero exit status on syntax error in graphviz 2.36.0

[Sebastian Bank]

unlike in version 2.38, graphviz 2.36.0 does not return a non-zero exit status on syntax errors:

$ echo 'nongraph' | dot -Tsvg && echo $?
Warning: <stdin>: syntax error in line 1 near 'nongraph'
0

(echo should not be executed: $? should be 1)

$ dot -V
dot - graphviz version 2.36.0 (20140111.2315)

$ apt-cache policy graphviz
graphviz:
  Installed: 2.36.0-0ubuntu3.2

$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"

AFAIU, the following change needs to be backported:
https://github.com/ellson/graphviz/commit/181433391b1ea19caf999f91b14a50f0499b831e

Upstream bugs:
https://github.com/ellson/graphviz/issues/191 = http://www.graphviz.org/mantisbt/view.php?id=2521
https://github.com/ellson/graphviz/issues/243 = http://www.graphviz.org/mantisbt/view.php?id=2470