Minor fix to race condition that would cause the web interface to go into "failed" status, but not show the error in the error panel.
Minor fix to race condition that would cause the web interface to go into
"failed" status, but not show the error in the error panel.

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