Return early from Renderering if we can't render. Use cloned view manager helper.

Author: Kyle Spraggs

src/ZfcTwig/Module.php

@@ -56,7 +56,7 @@ public function getServiceConfig()
                     // If we don't clone it then the ViewHelpers use PhpRenderer.
                     // This should really be changed in ZF Proper to call the event to determine which Renderer to use.
                     //return clone $sm->get('ViewHelperManager');
-                    return $sm->get('ViewHelperManager');
+                    return clone $sm->get('ViewHelperManager');
                 },
                 'ZfcTwigViewStrategy' => function($sm) {
                     $strategy = new TwigStrategy($sm->get('ZfcTwigRenderer'));

src/ZfcTwig/View/Renderer/TwigRenderer.php

@@ -194,6 +194,10 @@ public function render($nameOrModel, $values = array())
             $values = (array) $model->getVariables();
         }
 
+        if (!$this->canRender($nameOrModel)) {
+            return null;
+        }
+
         if ($model && $this->canRenderTrees() && $model->hasChildren()) {
             if (!isset($values['content'])) {
                 $values['content'] = '';
@@ -211,9 +215,6 @@ public function render($nameOrModel, $values = array())
 
         /** @var $template \Twig_Template */
         $template = $this->resolver->resolve($nameOrModel, $this);
-        if ($template) {
-            return $template->render((array) $values);
-        }
-        return null;
+        return $template->render((array) $values);
     }
 }