Fix for signatures of public typed properties (new in PHP7.4), issue #…

…32465

src/Symfony/Component/Config/Resource/ReflectionClassResource.php

@@ -136,7 +136,7 @@ private function generateSignature(\ReflectionClass $class)
 
             foreach ($class->getProperties(\ReflectionProperty::IS_PUBLIC | \ReflectionProperty::IS_PROTECTED) as $p) {
                 yield $p->getDocComment().$p;
-                yield print_r($defaults[$p->name], true);
+                yield print_r($defaults[$p->name] ?? null, true);
             }
         }