Med: Strip whitespace before checking for empty string in HA LVM
Using vgs to check for a tag with 'vgs -o tags --noheadings' will
produce 9 space characters when no tags are found. This patch strips
that space before checking whether the output is empty.
Patch originally from Frank Danapfel <fdanapfe@redhat.com>
Signed-off-by: Ryan McCabe <rmccabe@redhat.com>