handle nullable pdf params

backend/app/Element/UseCases/GetElementPdf/GetElementPdf.php

@@ -2,6 +2,7 @@
 
 namespace App\Element\UseCases\GetElementPdf;
 
+use App\Exceptions\BadRequestException;
 use App\Exceptions\NotFoundException;
 use App\Shared\Files\Filesystem;
 
@@ -16,10 +17,19 @@ class GetElementPdf
     }
 
     /**
+     * @throws BadRequestException
      * @throws NotFoundException
      */
     public function execute(GetElementPdfRequest $request): GetElementPdfResult
     {
+        if ($request->folder === null) {
+            throw new BadRequestException('folder is required');
+        }
+
+        if ($request->fileName === null) {
+            throw new BadRequestException('fileName is required');
+        }
+
         if (!$this->isAllowedPdfFolder($request->folder)) {
             throw new NotFoundException('PDF not found');
         }