MAGETWO-56063: After upgrading from 2.0.7 to 2.1, editing a category gives a 500 error

- removed unused code

Author: buskamuza

app/code/Magento/Eav/Model/ResourceModel/ReadHandler.php

@@ -6,7 +6,6 @@
 namespace Magento\Eav\Model\ResourceModel;
 
 use Magento\Eav\Api\AttributeRepositoryInterface as AttributeRepository;
-use Magento\Framework\App\ObjectManager;
 use Magento\Framework\EntityManager\MetadataPool;
 use Magento\Framework\Api\SearchCriteriaBuilder;
 use Magento\Framework\App\ResourceConnection as AppResource;