Merge branch '4.4' into 5.1

* 4.4:
  CS: Apply ternary_to_null_coalescing fixer

Author: derrabus

Extension/HttpKernelRuntime.php

@@ -37,7 +37,7 @@ public function __construct(FragmentHandler $handler)
      */
     public function renderFragment($uri, array $options = []): string
     {
-        $strategy = isset($options['strategy']) ? $options['strategy'] : 'inline';
+        $strategy = $options['strategy'] ?? 'inline';
         unset($options['strategy']);
 
         return $this->handler->render($uri, $strategy, $options);

Node/SearchAndRenderBlockNode.php

@@ -40,7 +40,7 @@ public function compile(Compiler $compiler): void
                     // The "label" function expects the label in the second and
                     // the variables in the third argument
                     $label = $arguments[1];
-                    $variables = isset($arguments[2]) ? $arguments[2] : null;
+                    $variables = $arguments[2] ?? null;
                     $lineno = $label->getTemplateLine();
 
                     if ($label instanceof ConstantExpression) {