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Extend lvm_vg_write to remove pvs removed in lvm_vg_reduce. The lvm volume_group internal structure removed_pvs is used for that. The list is empty afterwards. Add new test for vg->pvs emptyness to lvm_vg_write to prevent to write empty vgs. This is needed because of lvm_vg_reduce and lv_vg_create, which creates empty vgs. Signed-off-by: Thomas Woerner <twoerner@redhat.com> Acked-by: Dave Wysochanski <dwysocha@redhat.com> Author: Dave Wysochanski <dwysocha@redhat.com>