edit pannel error: TypeError: Cannot read property 'length' of null

[ruanben]

grafana version: 8.4.1
I create a dashboard and an empty timeseries pannel:

`board := sdk.NewBoard(d.DashName)
board.Time.From = "now-15m"
board.Time.To = "now"

panel := sdk.NewTimeseries("empty panel")
panel.Editable = true

board.Panels = append(board.Panels, panel)
dashRes, err := c.SetDashboard(ctx,*board, sdk.SetDashboardParams{
Overwrite: false,
})`

after i create it , I can see it in grafana, but when i edit the pannel, failed:

[mhodovaniuk]

I had a similar issue. It was missing TimeseriesOptions. Fixed it by adding some values, for example:

panel.TimeseriesPanel.Options = sdk.TimeseriesOptions{
	Legend:  sdk.TimeseriesLegendOptions{Calcs: []string{}, DisplayMode: "list", Placement: "bottom"},
	Tooltip: sdk.TimeseriesTooltipOptions{Mode: "single"},
}