Renderer: Fix raycasting with Three >= r69. Needs to be reviewed again on r70 if three provides this utility again. Fix providing null/undefined submeshes to raycasting targets.
Renderer: Fix raycasting with Three >= r69. Needs to be reviewed again on r70 if three provides this utility again. Fix providing null/undefined submeshes to raycasting targets.

realXtend/WebTundra,realXtend/WebTundra