fix for replay files with no events + frontend fix for src & dest node names

// Start - starts replay execution

func (r *ReplayMgr) Start(fileName string, replay ceModel.Replay, loop bool, ignoreInitEvent bool) error {

	if !r.isStarted {

	// Verify replay file can be started

	if r.isStarted {

		return errors.New("Replay already running, filename: " + r.currentFileName)

	} else if len(replay.Events) <= 1 {

		return errors.New("Replay has no events, filename: " + r.currentFileName)

	}

	// Initialize replay execution

	r.timeStarted = time.Now()

	r.isStarted = true

	r.nextEventIndex = 0

	r.loop = loop

	r.currentFileName = fileName

	r.ignoreInitEvent = ignoreInitEvent

		//executing the events

	// Start playing events

	_ = r.playEventByIndex()

	} else {

		return errors.New("Replay already running, filename: " + r.currentFileName)

	}

	return nil

}

    const root = this.getRoot();

    const nodes = root.descendants();

    const apps = nodes.filter(isApp);

    const appIds = apps.map(a => a.data.id);

    const appIds = apps.map(a => a.data.name);

    appIds.unshift('None');

    const selectedSource = appIds.includes(this.props.sourceNodeSelected) ? this.props.sourceNodeSelected : 'None';