when setting default command to gcli app, ./appcli can't run with default command about gcli HOT 1 OPEN

func (app *App) prepareRun() (code int, name string) {
	// find command name.
	name = app.findCommandName()
	if name == HelpCommand {
		if len(app.args) == 0 { // like 'help'
			app.showApplicationHelp()
		} else {
			// like 'help COMMAND'
			code = app.showCommandHelp(app.args)
		}
		return
	}

	// not input and not set defaultCommand
	if name == "" {
		if app.Func != nil {
			code = app.doRunFunc(app.args)
		} else {
			app.showApplicationHelp()
		}
		return
	}
    
	// name is not empty, but is not command.
	if app.inputName == "" {
		Logf(VerbDebug, "input the command is not an registered: %s", name)
		hookData := map[string]any{"name": name, "args": app.args}

		// fire events
		if stop := app.Fire(events.OnAppCmdNotFound, hookData); stop {
			return
		}
		if stop := app.Fire(events.OnCmdNotFound, hookData); stop {
			return
		}

		app.showCommandTips(name)
		return
	}

	// is valid command name.
	app.commandName = name
	return GOON, name
}