[Bug] Clustering example - onClick returning undefined

Description

The clustering example onClick function is returning undefined when clicking outside of clusters and on empty map space.

Expected Behavior

OnClick function to not return undefined.

Steps to Reproduce

1. Go to react-map-gl clustering example: http://visgl.github.io/react-map-gl/examples/clusters
2. Open up console
3. Click on a specific point or any empty map space
4. Notice error in console

Environment

• Framework version: Current/latest from assuming examples are running on latest build
• Map library: Current/latest from assuming examples are running on latest build
• Browser: Chrome 108.0
• OS: 13.1

Logs

Uncaught TypeError: Cannot read properties of undefined (reading 'properties')
at onClick (component---examples-clusters-src-app-tsx-ae435c98aa31b91df409.js:1:1591)
at Map._onPointerEvent (834b8338ea35f2c3d17eb82aef29032efb222d04-d473b88aba9c068a3050.js:1:20732)
at Map.fire (27-9fafbe3fd9a64912bea8.js:1:18842)
at t._fireEvent (834b8338ea35f2c3d17eb82aef29032efb222d04-d473b88aba9c068a3050.js:1:25834)
at Qr.click (27-9fafbe3fd9a64912bea8.js:1:813462)
at Rn.handleEvent (27-9fafbe3fd9a64912bea8.js:1:838674)

Start with the clustering example at https://visgl.github.io/react-map-gl/examples/clusters and reproduce the console error by clicking a point and empty map space. Inspect the example's onClick handler, then verify that clicks outside clusters no longer produce an undefined-property error.