修复获取系统未读消息时userInfo为空导致的获取不到uid导致的闪退问题

common/src/main/java/com/yunbao/common/manager/imrongcloud/MessageIMManager.java

@@ -98,6 +98,9 @@ public class MessageIMManager {
     public void getSystemMessages() {
         systemNumber = 0;
         IMLoginModel userInfo = IMLoginManager.get(mContext).getUserInfo();
+        if (userInfo == null) {
+            return;
+        }
         HttpClient.getInstance().get("Message.getLists", "getImUserInfo")
                 .params("uid", userInfo.getId())
                 .params("token", userInfo.getToken())