Prevent crash if H5P Integration does not provide file icon

Author: otacke

scripts/h5peditor-init.js

@@ -2,7 +2,7 @@
   H5PEditor.init = function ($form, $type, $upload, $create, $editor, $library, $params, $maxScore, $title, cancelSubmitCallback) {
     H5PEditor.$ = H5P.jQuery;
     H5PEditor.basePath = H5PIntegration.editor.libraryUrl;
-    H5PEditor.fileIcon = H5PIntegration.editor.fileIcon;
+    H5PEditor.fileIcon = H5PIntegration.editor.fileIcon ?? {};
     H5PEditor.ajaxPath = H5PIntegration.editor.ajaxPath;
     H5PEditor.filesPath = H5PIntegration.editor.filesPath;
     H5PEditor.apiVersion = H5PIntegration.editor.apiVersion;