Fix compatibility with newer jQuery versions

(cherry picked from commit 757f7053)

scripts/h5peditor-av.js

@@ -119,8 +119,8 @@ H5PEditor.widgets.video = H5PEditor.widgets.audio = H5PEditor.AV = (function ($)
       '</div>';
 
     var html = H5PEditor.createFieldMarkup(this.field, imageHtml, id);
-
     var $container = $(html).appendTo($wrapper);
+
     this.$files = $container.children('.file');
     this.$add = $container.children('.h5p-add-file').click(function () {
       self.$addDialog.addClass('h5p-open');
@@ -587,7 +587,7 @@ H5PEditor.widgets.video = H5PEditor.widgets.audio = H5PEditor.AV = (function ($)
         const id = 'av-upload-' + C.getNextId();
         return '<h3 id="' + id + '">' + H5PEditor.t('core', type === 'audio' ? 'uploadAudioTitle' : 'uploadVideoTitle') + '</h3>' +
           '<div class="h5p-file-drop-upload" tabindex="0" role="button" aria-labelledby="' + id + '">' +
-            '<div class="h5p-file-drop-upload-inner"/>' +
+            '<div class="h5p-file-drop-upload-inner ' + type + '"></div>' +
           '</div>';
 
       case 'InputLinkURL':

scripts/h5peditor-editor.js

@@ -230,7 +230,7 @@ ns.Editor = function (library, defaultParams, replace, iframeLoaded) {
 
   // Need to put this after the above replaceAll(), since that one makes Safari
   // 11 trigger a load event for the iframe
-  $iframe.load(load);
+  $iframe.on('load', load);
 
   // Populate iframe with the H5P Editor
   // (should not really be done until 'load', but might be here in case the iframe is reloaded?)

scripts/h5peditor-group.js

@@ -313,7 +313,7 @@ ns.Group.prototype.setSummary = function (summary) {
   // Parse html
   var summaryTextNode = ns.$.parseHTML(summary);
 
-  if (summaryTextNode !== null) {
+  if (summaryTextNode !== null && summaryTextNode.length) {
     summaryText = summaryTextNode[0].nodeValue;
   }