When we create the child, if an exception occurred it was transfering
back into the parent context. We don't want to do that us use a try/finally
to ensure we exit.
We need to ensure a traceback is printed and any queued UI messages which
may not have made it to the client UI at this point.
(Bitbake rev: dec1d2c26f6cb3ffeb44beaab0129cd531a6d08b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
8625f83e38