Merge pull request #408 from beliven-daniele-sarnari/main

fix: expect delta to not exist

src/Responses/Chat/CreateStreamedResponseChoice.php

@@ -20,7 +20,7 @@ public static function from(array $attributes): self
     {
         return new self(
             $attributes['index'],
-            CreateStreamedResponseDelta::from($attributes['delta']),
+            CreateStreamedResponseDelta::from($attributes['delta'] ?? []),
             $attributes['finish_reason'] ?? null,
         );
     }