Add checks for imagepath before invoking frisbeelauncher. Avoids obscure errors since we allow the path to be set to null. Setting the path to null via the web page is probably not a good idea, but I just did that by accident and noticed what happened ...
Add checks for imagepath before invoking frisbeelauncher. Avoids
obscure errors since we allow the path to be set to null. Setting the
path to null via the web page is probably not a good idea, but I just
did that by accident and noticed what happened ...

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