解决首页新学校管理员报错问题

web/src/main/java/com/ibeetl/jlw/service/StudentService.java

@@ -963,7 +963,10 @@ public class StudentService extends CoreBaseService<Student>{
         }
         List<Student> select = lambdaQuery.andEq(Student::getStudentStatus, 1).select();
         Set<Long> collect = select.stream().map(Student::getClassId).collect(Collectors.toSet());
-        List<SchoolClass> select1 = schoolClassDao.createLambdaQuery().andIn(SchoolClass::getClassId, collect).select();
+        List<SchoolClass> select1 = new ArrayList<SchoolClass>();
+        if(collect.size() > 0){
+            select1 = schoolClassDao.createLambdaQuery().andIn(SchoolClass::getClassId, collect).select();
+        }
         Set<Long> collect1 = select1.stream().map(SchoolClass::getClassId).collect(Collectors.toSet());
         select.removeIf(next -> !collect1.contains(next.getClassId()));
         return select;