Ref #32580: fix NPE

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/auth/impl/OpenIDAuthenticationBackend.java

@@ -293,9 +293,13 @@ protected GrantedAuthoritiesMapper createAuthoritiesMapper() {
             for (GrantedAuthority auth : authorities) {
                 if (auth instanceof OidcUserAuthority) {
                     OidcIdToken idToken = ((OidcUserAuthority) auth).getIdToken();
-                    mappedAuthorities.addAll(parseClaims(idToken, rolesClaimName));
+                    if (idToken != null) {
+                        mappedAuthorities.addAll(parseClaims(idToken, rolesClaimName));
+                    }
                     OidcUserInfo userInfo = ((OidcUserAuthority) auth).getUserInfo();
-                    mappedAuthorities.addAll(parseClaims(userInfo, rolesClaimName));
+                    if (userInfo != null) {
+                        mappedAuthorities.addAll(parseClaims(userInfo, rolesClaimName));
+                    }
                 }
             }
             return mappedAuthorities;