message: fix broken getLoci in Representation.createMulti
diff: @@ -281,13 +281,13 @@ namespace Representation {
  get state() { return currentState },
  get theme() { return currentTheme },
  getLoci: (pickingId?: PickingId) => {
  - if (pickingId === undefined) {
  - return reprList.length > 0 ? reprList[0].getLoci() : EmptyLoci
  - }
  + const { visuals } = currentProps
  for (let i = 0, il = reprList.length; i < il; ++i) {
  + if (!visuals || visuals.includes(reprMap[i])) {
  const loci = reprList[i].getLoci(pickingId)
  if (!isEmptyLoci(loci)) return loci
  }
  + }
  return EmptyLoci
  },
  mark: (loci: ModelLoci, action: MarkerAction) => {
  