fix

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

@@ -30,7 +30,7 @@
         tu.real_name_ speakerName,
         a.user_id_ as studentId,
         a.whether_mic_status_ as whetherMicStatus,
-        su.username_ as studentName,
+        IFNULL(su.username_, a.visitor_name_) as studentName,
         su.avatar_ as avatar,
         su.phone_ as phone,
         b.name_ as subName,