fix(app): render bounding boxes on media panel without points

[brianlund-wandb]

Description

• Fixes WB-16623

When logging a point cloud via wandb.Object3D with an empty list of points we still end up including a single, empty point in the file we use to generate the panel.

{
    "boxes":[
        {
            "color":[255, 0, 10],
            "corners":[ ... omitted for brevity ... ],
            "label":"Box"
        },
        {
            "color":[0, 255, 10],
            "corners":[... omitted for brevity...],
            "label":"Box-2"
        }
    ],
    "points":[
        []
    ],
    "type":"lidar/beta",
    "vectors":[]
}

The library we use to generate the panel, Babylon, fails to interpret that point, and generates a confusing panel.

The fix

• coerces that empty point to the position [0, 0, 0]
• ensures the camera focuses on the first bounding box (if it exists)

Testing

Reproduction steps are included in the ticket. The fix was tested locally, and includes a unit test for the coercion logic.

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[brianlund-wandb]

I have read the CLA Document and I hereby sign the CLA

[nhusher]

this seems reasonable to me