Detect extinct unnamed nodes before building links
Detect extinct unnamed nodes before building links

These will always fail, since there's no ott_id. I'm testing this based
on a dumb string test, so I've expanded it to detect the leading dagger.

OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree