fix bug

teachcloud-obe/src/main/java/com/qmth/teachcloud/obe/service/impl/TRBasicInfoServiceImpl.java

@@ -707,7 +707,7 @@ public class TRBasicInfoServiceImpl extends ServiceImpl<TRBasicInfoMapper, TRBas
 
             Double courseDegree = 0.0d;
             if (!CollectionUtils.isEmpty(targetCourseDegreeMap)) {
-                courseDegree = targetCourseDegreeMap.values().stream().mapToDouble(b -> b.doubleValue()).min().orElse(0);
+                courseDegree = targetCourseDegreeMap.values().stream().filter(s -> Objects.nonNull(s)).collect(Collectors.toList()).stream().mapToDouble(b -> b.doubleValue()).min().orElse(0);
             }
             //首行
             if (Objects.nonNull(trExamStudentTemp.getResultDetail())) {