How to use the jumbo.utils.session.svars.get function in jumbo

def exit(ctx):
    """Reset current context.

    :param ctx: Click context
    """

    if ss.svars.get('cluster'):
        ss.svars['cluster'] = None
        ctx.meta['jumbo_shell'].prompt = click.style('jumbo > ', fg='green')
    else:
        click.echo('Use "quit" to quit the shell. Exit only removes context.')

def list_bundles():
    """List bundles of the current cluster and available bundles"""

    path_list = [f.path.split('/')[-1]
                 for f in os.scandir(JUMBODIR+'bundles') if f.is_dir()]
    return (ss.svars.get('bundles', []), path_list)