Properly handle no passed packs.

Author: DaneEveritt

app/Repositories/ServerRepository.php

@@ -93,7 +93,7 @@ public function create(array $data)
             'disk' => 'required|numeric|min:0',
             'service' => 'required|numeric|min:1|exists:services,id',
             'option' => 'required|numeric|min:1|exists:service_options,id',
-            'pack' => 'required|numeric|min:0',
+            'pack' => 'sometimes|nullable|numeric|min:0',
             'startup' => 'string',
             'custom_image_name' => 'required_if:use_custom_image,on',
             'auto_deploy' => 'sometimes|boolean',