Make sure nodes always have an output property
Make sure nodes always have an output property

4545fcdc1808618723a4f5cd8a228b5c0b121ab7 broke nodes that did not have
an output property specified at all, and that relied on NIN.Node to
provide the whole output setup for them. This made ninjadev/re stop
working, so here's a fix for that.

ninjadev/nin,ninjadev/nin,ninjadev/nin