server: fix no response when execute 0 statment (#16770)
server: fix no response when execute 0 statment (#16770)


c4pt0r/tidb,c4pt0r/tidb,pingcap/tidb,XuHuaiyu/tidb,kyle-wang/tidb,pingcap/tidb,coocood/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,c4pt0r/tidb,XuHuaiyu/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,coocood/tidb,c4pt0r/tidb,ngaut/tidb