Don't refresh custom status on logout

The RoomTile gets remounted during logout due to the room stores being obliterated, however this causes the render() function to check if it should be showing custom status. If you have custom status enabled, and the person has a status set, the function errors due to no MatrixClient being available.

Fixes https://github.com/vector-im/riot-web/issues/9940

src/components/views/rooms/RoomTile.js

@@ -91,6 +91,8 @@ module.exports = React.createClass({
     },
 
     _getStatusMessageUser() {
+        if (!MatrixClientPeg.get()) return null; // We've probably been logged out
+
         const selfId = MatrixClientPeg.get().getUserId();
         const otherMember = this.props.room.currentState.getMembersExcept([selfId])[0];
         if (!otherMember) {