bugfix:获取未分班的单技班列表

mec-biz/src/main/resources/config/mybatis/ClassGroupMapper.xml

@@ -354,7 +354,7 @@
     <select id="findNoClassSubjects" resultMap="ClassGroup">
         SELECT cg.* FROM class_group cg LEFT JOIN class_group_relation cgr ON cgr.sub_class_group_id_=cg.id_
         WHERE cg.music_group_id_=#{musicGroupId} AND cg.type_ = 'NORMAL'
-        AND cg.group_type_='MUSIC' AND cg.del_flag_ = '0'
+        AND cg.group_type_='MUSIC' AND cg.del_flag_ = '0' and cgr.id_ is null
     </select>
 
     <select id="countTeacherNum" resultType="java.lang.Integer">