qemu: capabilities: Tolerate missing @qemuCaps in virQEMUCapsSupportsGICVersion
qemu: capabilities: Tolerate missing @qemuCaps in virQEMUCapsSupportsGICVersion

Report the given GIC version as unsupported if @qemuCapsi is NULL. This
will be helpful to run post parse callbacks even if qemu is not
currently installed.

nertpinx/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,libvirt/libvirt,andreabolognani/libvirt,nertpinx/libvirt,olafhering/libvirt,nertpinx/libvirt,jfehlig/libvirt,eskultety/libvirt,libvirt/libvirt,libvirt/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,crobinso/libvirt,jfehlig/libvirt,andreabolognani/libvirt,zippy2/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,eskultety/libvirt,nertpinx/libvirt,eskultety/libvirt,zippy2/libvirt,crobinso/libvirt,olafhering/libvirt,jardasgit/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,olafhering/libvirt,crobinso/libvirt,olafhering/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jardasgit/libvirt