[umpire] Fix condition when component tag is None

And make service property search readable.

BUG=None
TEST=None

Change-Id: I01c923e5c0babb9b8ca8faabd5c70ba927932682
Reviewed-on: https://chromium-review.googlesource.com/201543
Commit-Queue: Rong Chang <rongchang@chromium.org>
Tested-by: Rong Chang <rongchang@chromium.org>
Reviewed-by: Dean Liao <deanliao@chromium.org>
2 files changed