Fix a code example that does not work
Fix a code example that does not work

The current ACS example only redirects if a user is not authenticated. This fixes it.

Verified it works in my own SAML implementation for Tornado using python-saml.
mobify/python-saml,jkgneu12/python3-saml,mpaulweeks/python-saml,mpaulweeks/python-saml,jkgneu12/python3-saml,onelogin/python-saml,ninadpdr/python-saml,onelogin/python3-saml,appliedx/python-saml,onelogin/python-saml,sandeep048/python-saml,sandeep048/python-saml,novafloss/python-saml,novafloss/python-saml,ninadpdr/python-saml,onelogin/python3-saml,elbaschid/python-saml,mobify/python-saml,appliedx/python-saml,tachang/python-saml,tachang/python-saml,pitbulk/python3-saml,pitbulk/python3-saml,elbaschid/python-saml