message: Fix crash in TileDecoderService.
  Check that geom.objInfos[0] is an object before trying to check if
  it has the "displacementMap" property.
diff: @@ -102,7 +102,7 @@ export class TileDecoderService extends WorkerService {
  if (
  geom.objInfos !== undefined &&
  geom.objInfos.length === 1 &&
  - geom.objInfos[0] !== undefined &&
  + typeof geom.objInfos[0] === "object" &&
  "displacementMap" in (geom.objInfos[0] as any)
  ) {
  transferList.push((geom.objInfos[0] as any).displacementMap.buffer);
  