static exists(view) {

    if (!view) {

      return false;
    }

    if (view instanceof ViewAbstraction) {

      view = view.configTRef;

    } else {

      view = ViewAbstraction._getRootPath(view);
    }

    return utils.tiddlerExists(view);

  }
A view exists if the the view's root exists as tiddler in the store.

@return {ViewAbstraction|string}