KYLIN-3184 The project on the query page sometimes shows '_null'
KYLIN-3184 The project on the query page sometimes shows '_null'

Signed-off-by: Billy Liu <cfa021d63eda38fe6b12eac9ebbf07be3575033b@apache.org>

apache/incubator-kylin,apache/kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin,apache/kylin,apache/kylin,apache/kylin,apache/kylin,apache/incubator-kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin