Correct client message when check mode fails

[Mierdin]

If I rename a native testlet to some bogus name, and run a testrun that referenced the old (correct) name, "check mode" obviously fails, but the client shows this:

vagrant@todddev:~/go/src/github.com/Mierdin/todd/docs/dsl$ todd run test-ping-dns-dc -y -j

RUNNING TEST: 4ee458f0d6f592bb3f02c065505c73d6d2993482a7b8aaf7b00d512de50c26e6

(Please be patient while the test finishes...)
Problem subscribing to testrun updates stream: Invalid status received.
Will now watch the testrun metrics API for 45 seconds to see if we get a result that way. Please wait...

Would be nice if the client message indicate that there was still some hope this would work.