Code review comment for ~pwlars/checkbox-ng:get-test-outcome-stats

I almost forgot to mention... I tested this by creating a small dummy provider with 2 simple tests (one pass, one fail) and 2 attachment jobs (1 pass, 1 fail). Without the patch, I see 4 tests, 2 fails. With the pass, I only see the two actual tests, with 1 failed.