WebGPURenderer: Fall back to default texture when texture creation fails.

[ycw]

Fixed #32852.

suggested by @Mugen87,

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	357.49 84.84	357.49 84.84	+0 B +0 B
WebGPU	621.89 172.77	622.01 172.81	+119 B +33 B
WebGPU Nodes	620.49 172.53	620.61 172.56	+119 B +31 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	490.27 119.86	490.27 119.86	+0 B +0 B
WebGPU	692.79 188.01	692.91 188.04	+120 B +30 B
WebGPU Nodes	642.17 175.11	642.29 175.14	+120 B +32 B