The VG-LVname string is not a key in the dictionary constructed from the 'lvm
lvs' output and if by some chance (really high on Python 3) e.g. a thin pool is
requested to be added by a thin LV, using VG-LVname as the key raises a KeyError
while the info about the pool LV is in the dictionary as expected.
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/61