SAML assertion and Google setup

We have the SAML setup working between Mendix and Google G Suite. It seems however that Google advises that when going to the assertion URL a check should be made if an assertion is available and otherwise redirect to the login page. So going to https://someURL.mendixcloud.com/SSO/assertion should when empty redirect to https://someURL.mendixcloud.com/SSO/login. To my knowledge the current SAML module does not support this. Or am I mistaken and did I do something wrong with the request handlers?

Regards,

Ronald

[EDIT 11-10-2017]

Note that the SAML does work, only sometimes the user has to click again on the SSO link.