Exception "ValueError: not enough values to unpack (expected 2, got 1)" happens with parser "Vgs"

[huali027]

On one of my cluster hosts, the command of "vgs --nameprefixes --noheadings --separator='|' -a -o vg_all" is like:

WARNING: locking_type (0) is deprecated, using --nolocking.
WARNING: File locking is disabled.
Reading VG shared_vg1 without a lock.
LVM2_VG_FMT='lvm2'|LVM2_VG_UUID='V1AMDw-e9x6-AdCq-p3Hr-6cYn-otra-ducLAc'|LVM2_VG_NAME='rhel'|LVM2_VG_ATTR='wz--n-'|LVM2_VG_PERMISSIONS='writeable'|LVM2_VG_EXTENDABLE='extendable'|LVM2_VG_EXPORTED=''|LVM2_VG_AUTOACTIVATION='enabled'|LVM2_VG_PARTIAL=''|LVM2_VG_ALLOCATION_POLICY='normal'|LVM2_VG_CLUSTERED=''|LVM2_VG_SHARED=''|LVM2_VG_SIZE='<29.00g'|LVM2_VG_FREE='0 '|LVM2_VG_SYSID=''|LVM2_VG_SYSTEMID=''|LVM2_VG_LOCK_TYPE=''|LVM2_VG_LOCK_ARGS=''|LVM2_VG_EXTENT_SIZE='4.00m'|LVM2_VG_EXTENT_COUNT='7423'|LVM2_VG_FREE_COUNT='0'|LVM2_MAX_LV='0'|LVM2_MAX_PV='0'|LVM2_PV_COUNT='1'|LVM2_VG_MISSING_PV_COUNT='0'|LVM2_LV_COUNT='2'|LVM2_SNAP_COUNT='0'|LVM2_VG_SEQNO='3'|LVM2_VG_TAGS=''|LVM2_VG_PROFILE=''|LVM2_VG_MDA_COUNT='1'|LVM2_VG_MDA_USED_COUNT='1'|LVM2_VG_MDA_FREE='507.50k'|LVM2_VG_MDA_SIZE='1020.00k'|LVM2_VG_MDA_COPIES='unmanaged'

When parsing the content with the parser "Vgs", it raises the following error:

ValueError: not enough values to unpack (expected 2, got 1)

It considers "Reading VG shared_vg1 without a lock" as valid content too.