Fixes problem with resetting focusedVideoInfo when participant leaves the room. Fixes error when display name is processed after participant has left.

index.html

     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=81"></script>
+    <script src="libs/app.bundle.js?v=82"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=7"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

modules/UI/videolayout/VideoLayout.js

  * Sets the display name for the given video span id.
  */
 function setDisplayName(videoSpanId, displayName, key) {
+
+    if (!$('#' + videoSpanId).length) {
+        console.warn(
+            "Unable to set displayName - " + videoSpanId + " does not exist");
+        return;
+    }
+
     var nameSpan = $('#' + videoSpanId + '>span.displayname');
     var defaultLocalDisplayName = APP.translation.generateTranslatonHTML(
         interfaceConfig.DEFAULT_LOCAL_DISPLAY_NAME);
 
     my.participantLeft = function (jid) {
         // Unlock large video
-        if (focusedVideoInfo && focusedVideoInfo.jid === jid)
+        var resourceJid = Strophe.getResourceFromJid(jid);
+        if (focusedVideoInfo && focusedVideoInfo.resourceJid === resourceJid)
         {
             console.info("Focused video owner has left the conference");
             focusedVideoInfo = null;