fix: separate null checks for contentDto and templateDto in FrontendController

Author: cklei-carly

src/Http/Controllers/FrontendController.php

@@ -27,7 +27,7 @@ public function __invoke(...$args)
         $templateDto = $dto->template;
         $locale = $dto->locale;
 
-        if (is_null($contentDto) || is_null($templateDto)) {
+        if (is_null($contentDto)) {
             abort(404);
         }
 
@@ -43,6 +43,10 @@ public function __invoke(...$args)
 
         }
 
+        if (is_null($templateDto)) {
+            abort(404);
+        }
+
         if (blank($templateDto->content)) {
             abort(404);
         }