qemu: Avoid crash in qemuDiskGetActualType
Libvirtd would crash if a domain contained an empty cdrom drive of type='volume' as the disk def->srcpool member would be dereferenced. Fix it by checking if the source pool is present before dereferencing it. Also alter tests to catch this issue in the future. Reported by: Kevin Shanahan Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1056328
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