#5 unknown device in .device directive cause bus error

[Bill Westfield]

If an unknown device is specified in a .device directive,
pi->device is left as NULL, which soon causes a bus error.
This patch restores pi->device to it's initial default
value. (an unknown device is currently apparently a
fatal error, and I'm not sure that that doesn't need
"fixing" as well, but that's a more controvesial and
more complex issue.)

[bigbuggy]

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Solved in 1.2.0. B.Arenfeld