Can't export dashboards with CLI if 'admin' user is not created about superset HOT 1 OPEN

@click.command()
@with_appcontext
@click.option(
    "--dashboard-file",
    "-f",
    help="Specify the file to export to",
)
@click.option(
    "--username",
    "-u",
    required=True,
    help="Specify the user name to use for exporting dashboards",
)
def export_dashboards(dashboard_file: Optional[str] = None, username: Optional[str] = None) -> None:
    """Export dashboards to ZIP file"""
    from superset.commands.dashboard.export import ExportDashboardsCommand
    from superset.models.dashboard import Dashboard

    g.user = security_manager.find_user(username=username)

    dashboard_ids = [id_ for (id_,) in db.session.query(Dashboard.id).all()]
    timestamp = datetime.now().strftime("%Y%m%dT%H%M%S")
    root = f"dashboard_export_{timestamp}"
    dashboard_file = dashboard_file or f"{root}.zip"

    try:
        with ZipFile(dashboard_file, "w") as bundle:
            for file_name, file_content in ExportDashboardsCommand(dashboard_ids).run():
                with bundle.open(f"{root}/{file_name}", "w") as fp:
                    fp.write(file_content().encode())
    except Exception:
        logger.exception(
            "There was an error when exporting the dashboards, please check "
            "the exception traceback in the log"
        )
        sys.exit(1)