add null guard in create text use case

app/Text/UseCases/CreateText.php

@@ -2,6 +2,7 @@
 
 namespace App\Text\UseCases;
 
+use App\Exceptions\BadRequestException;
 use App\Text\Text;
 use App\Text\CreateTextDto;
 use App\Text\TextRepository;
@@ -17,6 +18,10 @@ class CreateText
 
     public function execute(CreateTextRequest $request): Text
     {
+        if ($request->name === null) {
+            throw new BadRequestException('name is required');
+        }
+
         $text = $this->textRepo->create(new CreateTextDto(
             name: $request->name,
         ));