Ubuntu 14.04 kickstart

Hello,

I'm setting a Ubuntu 14.04 kickstart. For the most part it works, although it hangs at a prompt that I can't seem to get rid of.

It hangs at Configuring grub-pc. Saying that I chose not to install GRUB to any devices.
I choose (manually) Continue without installing Grub? I select yes and it finishes without issue. (It does configure this later on and it works) how do I stop this prompt?

I've tried the following with no luck to my kickstart config.

# Continue without installing GRUB?
preseed grub-pc grub-pc/install_devices_empty boolean yes

and

# Setup the disk
d-i grub-installer/only_debian boolean yes

Should add in that this is on being run on Xencenter 6.5 and that this is a VM.

Any thoughts?

Bump.