[修改] 修改试卷数据非空判断表达式.

src/app/examiner/examiner-index/examiner-index.component.ts

@@ -483,7 +483,7 @@ export class editorsDia{
         this.snackBar.open('修改名称时间成功','确定',config);
         setTimeout(() => {
           this.http.get(`/api/Papers/${this.datas.id}`).subscribe((data:any) => {
-            if(data.paperDataInfo.length==0){
+            if (data.paperDataInfo == null || data.paperDataInfo.length == 0) {
               this.http.delete(`/api/Papers/${this.datas.id}`).subscribe((data:any) => {
               })
               this.http.post('/api/Papers',params).subscribe(data => {