Scatterplot: Tooltip TypeError for empty data

[cbix]

In general the Scatterplot works really well with TypeScript, however in nivo 0.87.0 the typings for (custom) tooltip seem to be off and may cause a runtime TypeError if the data set is empty, e.g.

TypeError: Cannot read properties of undefined (reading 'data')
    at Tooltip (...)
    [...]

To reproduce:

<ScatterPlot
  width={300}
  height={300}
  data={[{ id: 'data', data: [] }]}
/>

Then hover over the chart.

Expected solutions:

1. either not render the Tooltip with node === undefined, or
2. make node optional in tooltip props type and handle the undefined case in the default tooltip