staged_shortlog does not fail when removing submodule
staged_shortlog does not fail when removing submodule

Signed-off-by: Chris Adams <4ef11657d36f584463e94897232bb7653804a10a@pivotallabs.com>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release