fixbug

themis-business/src/main/java/com/qmth/themis/business/service/impl/TOeExamRecordServiceImpl.java

@@ -255,6 +255,9 @@ public class TOeExamRecordServiceImpl extends ServiceImpl<TOeExamRecordMapper, T
 
     private boolean checkSingleChoice(String answerArray, JSONArray ar) {
         JSONArray an = JSONArray.parseArray(answerArray);
+        if(an.size()==0) {
+        	return false;
+        }
         int a = an.getIntValue(0);
         return checkSingleChoice(a, ar);
     }