travis-ci/travis.rb — pull request #222 by nbessi (2014-08-08 14:36:26+00:00)
Title: Fix Validation failed error using sshkey --upload

when using `travis sshkey --upload a_file` without a passpharse error ::

Validation failed (value: missing field, value: not a private key)

is raised as rsa_key is empty due to wrong empty return value