Twig partial() function should not throw exception

This allows checking if a partial exists

modules/cms/twig/Extension.php

@@ -98,11 +98,12 @@ class Extension extends Twig_Extension
      * Renders a partial.
      * @param string $name Specifies the partial name.
      * @param array $parameters A optional list of parameters to pass to the partial.
+     * @param bool $throwException Throw an exception if the partial is not found.
      * @return string Returns the partial contents.
      */
-    public function partialFunction($name, $parameters = [])
+    public function partialFunction($name, $parameters = [], $throwException = false)
     {
-        return $this->controller->renderPartial($name, $parameters);
+        return $this->controller->renderPartial($name, $parameters, $throwException);
     }
 
     /**

modules/cms/twig/PartialNode.php

@@ -37,6 +37,7 @@ class PartialNode extends Twig_Node
             ->write("echo \$this->env->getExtension('Cms\Twig\Extension')->partialFunction(")
             ->subcompile($this->getNode('nodes')->getNode(0))
             ->write(", \$context['__cms_partial_params']")
+            ->write(", true")
             ->write(");\n")
         ;