Missing or malformed AuthnContext in SAML Response

[peppelinux]

It seems that a SP handle pretty well a Response with missing or malformed AuthnContext element, like followings:

        <saml:AuthnStatement AuthnInstant="2021-01-24T14:22:10Z" SessionIndex="_a2fae832-ad12-4f71-8ab5-d04923e2c6c1">
            <saml:AuthnContext>
            </saml:AuthnContext>
        </saml:AuthnStatement>

      <saml:AuthnStatement AuthnInstant="2021-01-24T14:24:26Z" SessionIndex="_cd77b612-a171-4cc2-a179-fed1017caae9">
            <saml:AuthnContext>
                <saml:AuthnContextClassRef/>
            </saml:AuthnContext>
      </saml:AuthnStatement>

        <saml:AuthnStatement AuthnInstant="2021-01-24T14:25:14Z" SessionIndex="_93f31eca-b49a-43a6-8ec9-ba08edab5f8d">
        </saml:AuthnStatement>