query empty Entity but response R{exception=Exception: emptly collection, status=26, data=null}

[zhansg]

when query a not existent data, the response is "queryResultsR: R{exception=Exception: emptly collection, status=26, data=null}", it's too scary, because I've really encountered this kind of situation. suggeste to correct the reply information, such as "empty entity". my milvus-sdk-java version: 2.0.4, If fixed, ignore it.