Only shift 1st arg if file exists
Only shift 1st arg if file exists

Signed-off-by: Mark DeLillo <cb16bf7df25dbf84b90c1f94696c8a91f946dc1d@pivotal.io>

cloudfoundry-incubator/wats,cloudfoundry/wats,cloudfoundry-incubator/wats,cloudfoundry-incubator/wats,cloudfoundry/wats,cloudfoundry/wats,cloudfoundry/wats,cloudfoundry/wats,cloudfoundry-incubator/wats,cloudfoundry-incubator/wats