Rendering a kexec template doesn't show kernel and initram entries on Red Hat Satellite 6.

Issue

• Rendering a kexec template doesn't show kernel and initram entries on Red Hat Satellite 6.

  {
  "comment": "WARNING: Both kernel and initram are not set in preview mode due to http://projects.theforeman.org/issues/19737",
  "kernel": "",
  "initram": "",
  "append": "ks=http://satellite.example.com/unattended/provision?token=a56db299-52b6-473c-b331-d46d98280ca0&static=yes inst.ks.sendmac ip=::::::none nameserver= ksdevice=bootif BOOTIF= nomodeset ",
  "extra": ["--args-linux"]
  }