message: mol-plugin: fix Volume streaming when clearing state
diff: @@ -235,6 +235,8 @@ export namespace VolumeStreaming {
  });
  this.subscribeObservable(this.plugin.managers.structure.focus.behaviors.current, (entry) => {
  + if (!this.plugin.state.data.tree.children.has(this.ref)) return;
  +
  const loci = entry ? entry.loci : EmptyLoci;
  if (this.params.entry.params.view.name !== 'selection-box') {
  