DispVM fails to launch if DVM template has never been launched

[andrewdavidwong]

Qubes OS version (e.g., R3.1):

R3.2-rc1

Problem description:

one more thing: to get dispvm working i had to launch firefox in
fedora-23-dvm, shut fedora-23-dvm down, and then try to launch a disp-vm.
dont ask why, it has to do with how disposable-vms are created and
initialized and the savefile, etc. theres a bug the first time you try to
launch a disp-vm if it is before fedora-23-dvm has ever been launched.

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