Unix: fixed uncaught OSError exception raised when executing ping fails.
Unix: fixed uncaught OSError exception raised when executing ping fails.

Signed-off-by: Daniel Folkinshteyn <c89479571640853a547e0bfdade4423027407e94@users.sourceforge.net>

Ban3/Limnoria,ProgVal/Limnoria-test,ProgVal/Limnoria-test,Ban3/Limnoria