tree a56a9758167d8815b84c87d86f838da8542922b2
parent 814a339458224d2b8b6395520b73a5ce37c061b7
author Bob Lantz <rlantz@cs.stanford.edu> 1455176513 -0800
committer Bob Lantz <rlantz@cs.stanford.edu> 1456401549 -0800

Correctly handle case when .tar.gz archive is missing

Previously, it would succeed since the checksum command would
return nothing in standard output.

Change-Id: I1a73d20a0e085107be8362a6226b1a213ecdab78