Fix from several months back when retesting the auto-adaptation path: make sure colocate factor does not end up null
Fix from several months back when retesting the auto-adaptation path:
make sure colocate factor does not end up null

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome