Fix error with json reports with multi-valued results.

BUG=None
TEST=Tested in in role account.

Change-Id: I502dda87f9a3647e8bea61a54f587813eb18b755
Reviewed-on: https://chrome-internal-review.googlesource.com/255739
Commit-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Reviewed-by: Yunlian Jiang <yunlian@google.com>
1 file changed