【实训项目】选择题实训如果用户不写答案，不用传参数到标准答案

public/react/src/modules/tpm/challengesnew/TPMquestion.js

@@ -698,7 +698,7 @@ export default class TPMquestion extends Component {
 					  let newnewanswerMDvalue = this.editanswersRef.current.getValue().trim();
             console.log(newnewanswerMDvalue)
             if(newnewanswerMDvalue===""||newnewanswerMDvalue===" "){
-                newnewanswerMDvalue=newlist
+                newnewanswerMDvalue=undefined
             }
 
             url="/shixuns/" + id + "/challenges/" + challenge_id + "/update_choose_question.json?choose_id="+challenge_choose_id;
@@ -747,7 +747,7 @@ export default class TPMquestion extends Component {
             let newnewanswerMDvalue = this.newquestioMDMdCont.current.getValue().trim();
 
             if(newnewanswerMDvalue===""||newnewanswerMDvalue===" "){
-                newnewanswerMDvalue=newlist
+                newnewanswerMDvalue=undefined
             }
             url="/shixuns/" + id + "/challenges/" + challenge_id + "/create_choose_question.json";
             axios.post(url,  {