docs: def get_current_scene_node():
      """Return the name of the jb_sceneNode, that describes the current scene or None if there is no scene node.
  
      :returns: the full name of the node or none, if there is no scene node
      :rtype: str | None
      :raises: None
      """
      c = cmds.namespaceInfo(':', listOnlyDependencyNodes=True, absoluteName=True, dagPath=True)
      l = cmds.ls(c, type='jb_sceneNode', absoluteName=True)
      if not l:
          return
      else:
          for n in sorted(l):
              if not cmds.listConnections("%s.reftrack" % n, d=False):
                  return n