[ReaR] Rear mkbackup fails with 'lvmdev' entry in /var/lib/rear/layout/disklayout.conf where volume_group or device is empty or more than one word

Issue

• In ReaR 2.6 below error is encountered when rear mkrescue, mkbackuponly, savelayout workflows are executed:

ERROR: LVM 'lvmdev' entry in /var/lib/rear/layout/disklayout.conf where volume_group or device is empty or more than one word
Some latest log messages since the last called script 220_lvm_layout.sh:
  2022-01-24 11:26:27.182456662 Including layout/save/GNU/Linux/220_lvm_layout.sh
  2022-01-24 11:26:27.184917867 Begin saving LVM layout ...
Aborting due to an error, check /var/log/rear/rear-example.log for details
Terminated