def create_yubikey_validationservice(app_config, **kwargs):
    """
    Make sure at least one ValidationService exists.
    """
    from otp_yubikey.models import ValidationService
    if app_config.label == 'otp_yubikey' and ValidationService.objects.all(
        ).count() == 0:
        ValidationService.objects.get_or_create(defaults={'name':
            'YubiCloud', 'use_ssl': True, 'param_sl': '', 'param_timeout': ''})
