qemu: command: Prepare memory device def formatter for missing target node
qemu: command: Prepare memory device def formatter for missing target node

Prepare the command line generator for the possibility that in some
configurations the target NUMA node info will be missing.

fabianfreyer/libvirt,fabianfreyer/libvirt,taget/libvirt,jfehlig/libvirt,taget/libvirt,taget/libvirt,datto/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,andreabolognani/libvirt,zippy2/libvirt,olafhering/libvirt,andreabolognani/libvirt,eskultety/libvirt,eskultety/libvirt,nertpinx/libvirt,taget/libvirt,andreabolognani/libvirt,rlaager/libvirt,rlaager/libvirt,rlaager/libvirt,jardasgit/libvirt,datto/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,andreabolognani/libvirt,datto/libvirt,olafhering/libvirt,datto/libvirt,rlaager/libvirt,taget/libvirt,jardasgit/libvirt,rlaager/libvirt,crobinso/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,eskultety/libvirt,nertpinx/libvirt,crobinso/libvirt,VenkatDatta/libvirt,zippy2/libvirt,eskultety/libvirt,libvirt/libvirt,libvirt/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,VenkatDatta/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zippy2/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,olafhering/libvirt,nertpinx/libvirt,crobinso/libvirt,datto/libvirt