[KEYCLOAK-3086] -  NPE when accessing Account with invalid clientId set as ?referrer, and additional referrer_uri set

 src/main/java/org/keycloak/protocol/cas/utils/RedirectUtils.java

@@ -42,8 +42,9 @@
    }

    public static String verifyRedirectUri(UriInfo uriInfo, String redirectUri, RealmModel realm, ClientModel client) {
        Set<String> validRedirects = client.getRedirectUris();
        return verifyRedirectUri(uriInfo, client.getRootUrl(), redirectUri, realm, validRedirects);
        if (client != null)
            return verifyRedirectUri(uriInfo, client.getRootUrl(), redirectUri, realm, client.getRedirectUris());
        return null;
    }

    public static Set<String> resolveValidRedirects(UriInfo uriInfo, String rootUrl, Set<String> validRedirects) {