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

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