SEC-1425: Replace use of Java 1.6 String.isEmpty().

web/src/main/java/org/springframework/security/web/authentication/rememberme/AbstractRememberMeServices.java

@@ -78,7 +78,7 @@ public abstract class AbstractRememberMeServices implements RememberMeServices,
 
         logger.debug("Remember-me cookie detected");
 
-        if (rememberMeCookie.isEmpty()) {
+        if (rememberMeCookie.length() == 0) {
             logger.debug("Cookie was empty");
             cancelCookie(request, response);
             return null;