lib/ui/taskexp: Validate gi import
When running bitbake -g -u taskexp without having gi python module or
and invalid gtk version, bitbake fails with a stack trace.
In case of import or version error, bitbake should exit with an error
message instead of a stack trace.
Signed-off-by: David Khouya <dakhouya@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 2a2c507f239b047f34765312df4168030e38b90d)
Signed-off-by: Steve Sakoman <steve@sakoman.com>