* fix a problem which deleted conversation can not get name occur crash ([88b05da](https://github.com/msgbyte/tailchat/commit/88b05da0c97d3a43f00a8149ab085477f89a942c))
* fix a problem which user info maybe return null cause error ([96d8cda](https://github.com/msgbyte/tailchat/commit/96d8cda5c3c1809d7319f395130ce8d62ee276b8))