tree 0b76f71d97691e6358e0ff43e672eba9ecca1b79
parent 7e711c1eca37f7100744ba518763ae3f95f48027
author keunyoung <keunyoung@google.com> 1364240158 -0700
committer keunyoung <keunyoung@google.com> 1364241944 -0700

make report generation more robust

- insert emptry values even if there is no result: allows tracking results from
  the same device
- fill device info with "unknown" if there is no device info
- For csv, only print summary value.

Change-Id: Ic4a59708f7629437f10a9c4318213f076c4d1c29