GitLab

In case a metadata is returned with valid tag but no data, count the
metadata entry as invalid.

Bug: 1155255
Test: compile and manually verify that camera works on DUT
Change-Id: I663ba5cdab177d95c83a77546c70ffd9122157f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2620741
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841938}