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

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:")
+	}
+}