[moblab] Fix mobmonitor DiskCheck on wukong

The DiskCheck mobmonitor check doesn't run on wukong.
In some cases, lsblk returns an empty string for the
removable field RM="". Make the regex more robust to find an empty
string and treat it as a valid value.

BUG=chromium:871833
TEST=osutils_unittest.py, systeminfo_unittest.py

Change-Id: I759b27369e4cb0ebdd1f8d87a2f7a6524e73410e
Reviewed-on: https://chromium-review.googlesource.com/1168599
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Matt Mallett <mattmallett@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
1 file changed
tree: c001347f5766d963e748ae84b113fe471fff873c
  1. COMMIT-QUEUE.ini
  2. OWNERS
  3. PRESUBMIT.cfg
  4. partner_ui/
  5. pylintrc
  6. scripts/
  7. src/