KYLIN-4537 Give a friendly tips to the user when getting task list fails
KYLIN-4537 Give a friendly tips to the user when getting task list fails

(cherry picked from commit ed7658d87104c9ab365062cbfed239341d33aa2b)

apache/kylin,apache/kylin,apache/kylin,apache/kylin,apache/kylin,apache/kylin,apache/kylin