Do not set default artifacts dir if one isn't present in the config [#161236240]
Do not set default artifacts dir if one isn't present in the config [#161236240]

Signed-off-by: Sebastian Vidrio <68ba84219e4e2d7d15fed3ed668bd2821314e420@pivotal.io>

cloudfoundry/cf-smoke-tests,cloudfoundry/cf-smoke-tests,cloudfoundry/cf-smoke-tests,cloudfoundry/cf-smoke-tests