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Show clearer messages and exit non-zero if there's nothing to upload. Change-Id: Icd9c13b9b1126610a409fc13d1d11bfc66f5e802 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/255834 Reviewed-by: David Pursehouse <dpursehouse@collab.net> Tested-by: Mike Frysinger <vapier@google.com>