Small fixes after merge

Author: rubenvanassche

docs/advanced-usage/get-data-from-a-class-quickly.md

@@ -46,7 +46,7 @@ class SongController
     {
         $data = $request->getData();
 
-        $song = Song::create($data);
+        $song = Song::create($data->toArray());
 
         return $data;
     }

src/Resolvers/TransformedDataResolver.php

@@ -59,6 +59,10 @@ private function transform(BaseData&TransformableData $data, TransformationConte
                     return $payload;
                 }
 
+                if ($property->type->isOptional && ! isset($data->{$name})) {
+                    return $payload;
+                }
+
                 if (! $this->shouldIncludeProperty($name, $data->{$name}, $context)) {
                     return $payload;
                 }