[merge request] Kubuntu Automation: exit nicer with non-existant commands with do-all

[Walter Lapchynski]

Currently, the `do-all` command accepts a required argument /command/ which
is called without checking to see if the command is actually valid. To deal
with this, we catch an OSError exception. Technically this, covers more
than just a file not found issue FWIW. The exit code is actually
specifically for a command not found, however.

Last commit here does the trick:
https://code.launchpad.net/~wxl/+git/kubuntu-automation/+ref/master

-- 
       @wxl | polka.bike
C563 CAC5 8BE1 2F22 A49D
68F6 8B57 A48B C4F2 051A
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