Merge branch 'fix-score-bug' into 'DEV'

Fix score bug







See merge request !832

mooctest-site-server/src/main/java/cn/iselab/mooctest/site/web/data/wrapper/ExerciseCollectionPythonCommunityVOWrapper.java

@@ -86,8 +86,8 @@ public class ExerciseCollectionPythonCommunityVOWrapper {
             if(submitRecord != null){
                 result = new Gson().fromJson(submitRecord.getResult(),SubmitRecordResult.class);
             }
-            exercise.setScore(result == null?0:result.getResults().get(caseId+"")
-                    .getMaxScore());
+            exercise.setScore(result == null?0:(result.getResults().containsKey(caseId+"")
+                    ?result.getResults().get(caseId+"").getMaxScore():0));
         }
 
         return exercise;