Remove container name not empty check

Signed-off-by: Megan Kostick <mkostick@us.ibm.com>
Upstream-commit: 98f857772f3be0985ab87c4bc6bd91e80e122c53
Component: engine

components/engine/api/client/diff.go

@@ -21,6 +21,10 @@ func (cli *DockerCli) CmdDiff(args ...string) error {
 	cmd.Require(flag.Exact, 1)
 	cmd.ParseFlags(args, true)
 
+	if cmd.Arg(0) == "" {
+		return fmt.Errorf("Container name cannot be empty")
+	}
+
 	rdr, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/changes", nil, nil)
 	if err != nil {
 		return err