fixbug

stmms-web/src/main/java/cn/com/qmth/stmms/admin/exam/LibraryController.java

@@ -187,8 +187,10 @@ public class LibraryController extends BaseExamController {
             model.addAttribute("questionNumbers", questionNumbers);
         }
         model.addAttribute("answerServer", answerServer);
-        model.addAttribute("answerUrl",
-                PictureUrlBuilder.getAnswerJson(examId, student.getSubjectCode(), null, student.getExamNumber()));
+        model.addAttribute(
+                "answerUrl",
+                PictureUrlBuilder.getAnswerJson(examId, student.getSubjectCode(), student.getPaperType(),
+                        student.getExamNumber()));
         return "modules/exam/jsonView";
     }
 }