fix for empty function not allowed in bash error when we don't want to register the service broker [#155384701](https://www.pivotaltracker.com/story/show/155384701)
fix for empty function not allowed in bash error when we don't want to register the service broker
[#155384701](https://www.pivotaltracker.com/story/show/155384701)

cloudfoundry-incubator/nfs-volume-release,cloudfoundry-incubator/nfs-volume-release,cloudfoundry-incubator/nfs-volume-release