Better error display for dev environments (#4363)

* Better error display for dev environments

Adding file and line numbers for the error display in dev environments to support and speed up template development.

* Style update ;)

* May the linter be with you

src/Sulu/Bundle/PreviewBundle/Preview/Renderer/PreviewRenderer.php

@@ -192,6 +192,12 @@ public function render($object, $id, $webspaceKey, $locale, $partial = false, $t
         try {
             $response = $this->handle($request);
         } catch (\Twig_Error $e) {
+            // dev/test only: display also the file and line which was causing the error
+            // for better debugging and faster development
+            if (in_array($this->environment, ['dev', 'test'])) {
+                $e->appendMessage(' (' . $e->getFile() . ' line ' . $e->getLine() . ')');
+            }
+
             throw new TwigException($e, $object, $id, $webspace, $locale);
         } catch (\InvalidArgumentException $e) {
             throw new TemplateNotFoundException($e, $object, $id, $webspace, $locale);