M #: Fix minor bug on LVM delete operation (#1584)
M #: Fix minor bug on LVM delete operation (#1584)

If ZERO_LVM_ON_DELETE is not set the lock name will be undefined
when trying to remove the device.
OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,OpenNebula/one