If unknown return code, don't pass LWR_UNKNOWN_RETURN_CODE back to galaxy send null.
If unknown return code, don't pass LWR_UNKNOWN_RETURN_CODE back to galaxy send null.

jmchilton/pulsar,natefoo/pulsar,ssorgatem/pulsar,natefoo/pulsar,jmchilton/lwr,jmchilton/lwr,ssorgatem/pulsar,galaxyproject/pulsar,galaxyproject/pulsar,jmchilton/pulsar