Fix for ajax responses overriden by postprocess

Plugin.php

@@ -46,7 +46,12 @@ class Plugin extends PluginBase
         {
             Event::listen('cms.page.postprocess', function($controller, $url, $page, $dataHolder) {
 
+                // Only parse strings, so that we don't interrupt
+                // ajax responses that are in object or array form
+                if (is_string($dataHolder->content))
+                {
                     $dataHolder->content = \Shortcode::parse($dataHolder->content);
+                }
 
             });
         }