[publication] Fix download prevention by overriding download notification function

modules/publication/php/files.class.inc

@@ -49,4 +49,20 @@ class Files extends \LORIS\Http\FilesPassthroughEndpoint
     {
         return "/files/";
     }
+
+    /**
+     * Send a notification for the download.
+     * 
+     * @param string $file The filename being downloaded
+     *
+     * @return void
+     * 
+     * @phan-suppress-next-line PhanUnusedProtectedMethodParameter
+     * Next line suppressed due to false-positive
+     * Unused parameter $file required to match parent signature
+     */
+    protected function doDownloadNotification($file)
+    {
+        // Not implemented for this module
+    }
 }