Terminal.xo patch: do not die if the cwd is gone

[Martin Langhoff]

Attached is a trivial patch that handles gracefully the situation
where cwd does not exist anymore or is no longer accessible to the
olpc user.

Without it,
 - mount a usb disk
 - open Terminal.xo, change directory to /media/my-usb-disk/
 - close Terminal.xo
 - unmount / remove usb disk
 - try to open Terminal.xo => fails to start

cheers,



m
-- 
 martin.langhoff at gmail.com
 martin at laptop.org -- School Server Architect
 - ask interesting questions
 - don't get distracted with shiny stuff  - working code first
 - http://wiki.laptop.org/go/User:Martinlanghoff
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