[Asset] Fix JsonManifest when there is no dependency on HttpClient

Author: maxhelias

Resources/config/assets.php

@@ -77,7 +77,7 @@
             ->abstract()
             ->args([
                 abstract_arg('manifest path'),
-                service('http_client'),
+                service('http_client')->nullOnInvalid(),
             ])
 
         ->set('assets.remote_json_manifest_version_strategy', RemoteJsonManifestVersionStrategy::class)