Credits tab is missing the Copyright

[echadwick-artist]

1. https://github.khronos.org/glTF-Sample-Viewer-Release/
2. Set the Model to "A Beautiful Game".
3. Click on the Credits tab.

Current result: the Generator metadata is displayed, but the Copyright metadata is not. Intended result: both Copyright and Generator data should be displayed.

The Asset section from ABeautifulGame.gltf:

   "asset" : {
        "copyright" : "Original assets by Moeen Sayed and Mujtaba Sayed for SideFX.",
        "generator" : "Khronos glTF Blender I/O v3.3.17",
        "version" : "2.0"
    },