修改定时任务bug

csm-service/cms-service-user/src/main/java/com/mmc/iuav/user/util/ScheduledTaskUtil.java

@@ -52,7 +52,7 @@ public class ScheduledTaskUtil {
     public void destroy(Integer userAccountId){
         redisTemplate.setValueSerializer(RedisSerializer.json());
         Set<String> keys = redisTemplate.keys("task" + userAccountId + "*");
-        if(keys.isEmpty()){
+        if(keys == null || keys.isEmpty()){
             return;
         }
         for (String key : keys) {