If Version is an empty string, suppress version output in usage help.

help.go

@@ -15,10 +15,10 @@ var AppHelpTemplate = `NAME:
    {{.Name}} - {{.Usage}}
 
 USAGE:
-   {{.Name}} {{if .Flags}}[global options] {{end}}command{{if .Flags}} [command options]{{end}} [arguments...]
+   {{.Name}} {{if .Flags}}[global options] {{end}}command{{if .Flags}} [command options]{{end}} [arguments...]{{if len .Version}}
 
 VERSION:
-   {{.Version}}{{if len .Authors}}
+   {{.Version}}{{end}}{{if len .Authors}}
 
 AUTHOR(S): 
    {{range .Authors}}{{ . }}{{end}}{{end}}

help_test.go

@@ -20,3 +20,17 @@ func Test_ShowAppHelp_NoAuthor(t *testing.T) {
 		t.Errorf("expected\n%snot to include %s", output.String(), "AUTHOR(S):")
 	}
 }
+
+func Test_ShowAppHelp_NoVersion(t *testing.T) {
+	output := new(bytes.Buffer)
+	app := cli.NewApp()
+	app.Writer = output
+
+	c := cli.NewContext(app, nil, nil)
+
+	cli.ShowAppHelp(c)
+
+	if bytes.Index(output.Bytes(), []byte("VERSION:")) != -1 {
+		t.Errorf("expected\n%snot to include %s", output.String(), "VERSION:")
+	}
+}