Redirect user for logout if no active session

 src/main/java/org/keycloak/protocol/cas/endpoints/LogoutEndpoint.java

@@ -23,6 +23,7 @@
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Response;
import java.net.URI;

public class LogoutEndpoint {
    private static final Logger logger = Logger.getLogger(LogoutEndpoint.class);
@@ -66,6 +67,12 @@
            logger.debug("finishing CAS browser logout");
            return response;
        }

        if (redirectUri != null) {
            logger.debugv("no active session, redirecting to {0}", redirectUri);
            return Response.status(302).location(URI.create(redirectUri)).build();
        }

        return ErrorPage.error(session, null, Response.Status.BAD_REQUEST, Messages.FAILED_LOGOUT);
    }