add error log for empty result (#2923)
* add error log for empty result Signed-off-by: Ngroot <yihua.mo@zilliz.com> * add error log for empty result Signed-off-by: Ngroot <yihua.mo@zilliz.com>
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* add error log for empty result Signed-off-by: Ngroot <yihua.mo@zilliz.com> * add error log for empty result Signed-off-by: Ngroot <yihua.mo@zilliz.com>