Some SSO methods may fail
|Triaged:||Fixed in Releases:|
|Bugzilla link:||Found in Releases:|
While we were investigating #7737 we found that we rely on SSO backend to define logout_url. Some of SSO backeds don't define it. Also we need to get into state as if we didn't define it (Base > Apache (defines) > Intercept (undefine) so we should make logout_url returning nil in Base.