Merge branch 'dev/v1.5.54_zsy' of jianyu/page_bigmember_pc into feature/v1.5.54

src/store/workspace/message.js

@@ -50,6 +50,7 @@ export default {
         isColumn: false,
         isColumnNewMsg: false,
         isMsgList: true,
+        isContainLetter: false,
         msgType: -1,
         isRead: 0,
         offset: 1,