[et-mgmt-tools] virtinst: fix virt-clone on sparse files

[Guido Guenther]

Hi,
attached patch fixes libvirt on fully sparse files. Otherwise you'll get a

Cloning from bla.img to bla2.img
ERROR:  local variable 'b' referenced before assignment

exception because b is uninitialzed (we never didn't write anything).
Patch is against 0.300.1. Please apply,
 -- Guido
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