Creates first the container before setting avatar, cause the avatar set will check the large video container type and type may be missing. Fixes error 'container of type undefined doesn't exist':

>    at LargeVideoManager.getContainer
>    at LargeVideoManager.get
>    at Object.isCurrentlyOnLarge
>    at Object.changeUserAvatar
>    at Object.UI.setUserAvatar
>    at Object.UI.addUser

modules/UI/UI.js

@@ -490,11 +490,11 @@ UI.addUser = function (id, displayName) {
         config.startAudioMuted > APP.conference.membersCount)
         UIUtil.playSoundNotification('userJoined');
 
-    // Configure avatar
-    UI.setUserAvatar(id);
-
     // Add Peer's container
     VideoLayout.addParticipantContainer(id);
+
+    // Configure avatar
+    UI.setUserAvatar(id);
 };
 
 /**