規格無し商品購入後、規格を作成すると Myページでシステムエラー

1. 規格無しの商品を購入
2. 1 の商品に規格を作成する
3. Myページを開くとシステムエラーになる

おそらく、 soft_delete flag の影響と思われます

以下、エラーログ

```
[2015-12-22 17:18:03] eccube.CRITICAL: Twig_Error_Runtime: An exception has been thrown during the rendering of a template ("Entity was not found.") in "Mypage/index.twig" at line 63. (uncaught exception) at C:\inetpub\wwwroot\ec-cube\vendor\twig\twig\lib\Twig\Template.php line 182 {"exception":"[object] (Twig_Error_Runtime(code: 0): An exception has been thrown during the rendering of a template (\"Entity was not found.\") in \"Mypage/index.twig\" at line 63. at C:\\inetpub\\wwwroot\\ec-cube\\vendor\\twig\\twig\\lib\\Twig\\Template.php:182, Doctrine\\ORM\\EntityNotFoundException(code: 0): Entity was not found. at C:\\inetpub\\wwwroot\\ec-cube\\vendor\\doctrine\\orm\\lib\\Doctrine\\ORM\\Proxy\\ProxyFactory.php:177)"} []

```