Suppress "VDD Open failed" warning if child process terminated

Another log message reported by  DesotoFireflite (VALHALLA) that can happen when a user has typed something while the programming is running and the program terminates before the data can be sent to it.
14 jobs for master in 9 minutes and 33 seconds (queued for 13 seconds)
Status Job ID Name Coverage
  Build
passed #29732
FreeBSD
jsdoor-freebsd

00:04:08

passed #29733
Linux
jsdoor-linux

00:06:17

passed #29735
FreeBSD
jsdoor-windows

00:01:56

passed #29727
FreeBSD
sbbs-freebsd

00:05:38

passed #29722
Linux
sbbs-linux

00:09:31

passed #29725
Windows
sbbs-windows

00:05:35

passed #29734
FreeBSD
sexpots-freebsd

00:00:15

passed #29723
Linux
sexpots-linux

00:00:24

passed #29726
Windows
sexpots-windows

00:00:37

passed #29730
FreeBSD
syncdraw-freebsd

00:00:31

passed #29731
Linux
syncdraw-linux

00:01:02

passed #29728
FreeBSD
syncterm-freebsd

00:01:09

passed #29724
Linux
syncterm-linux

00:02:56

passed #29729
FreeBSD
syncterm-windows

00:01:55