Remove extraneous newline
Remove extraneous newline

ui.DisplayWarning provides its own extra newline; no need to emit another

[#167925803](https://www.pivotaltracker.com/story/show/167925803)

Co-authored-by: Steve Taylor <2618d8eeb38db5666975df4fd945cc4512e3f384@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli