Fix testcases that expect trailing whitespace

and broken integration tests based of nil pointers

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: e16e9775d48b6cd0cc7b4a66114d1b9680aa2f31
Component: engine

components/engine/cli/command/image/images.go

@@ -69,7 +69,7 @@ func runImages(dockerCli *command.DockerCli, opts imagesOptions) error {
 		if len(dockerCli.ConfigFile().ImagesFormat) > 0 && !opts.quiet {
 			format = dockerCli.ConfigFile().ImagesFormat
 		} else {
-			format = "table"
+			format = formatter.TableFormatKey
 		}
 	}