[moblab] Better error for mobmonitor gs speed test

Don't show a command error pop-up if the user runs the speed test
diagnostic before configuring google storage. Just show a message
in the results area.

BUG=chromium:842011
TEST=Test on local device, cloud_storage_speedtest_unittest.py

Change-Id: I0d9d377b8e5568f471223e95596729eeea1aecc9
Reviewed-on: https://chromium-review.googlesource.com/1138988
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
1 file changed
tree: a6a70321a8e7542bbf29f2cf7659c554ce0b2dad
  1. COMMIT-QUEUE.ini
  2. OWNERS
  3. PRESUBMIT.cfg
  4. partner_ui/
  5. pylintrc
  6. scripts/
  7. src/