MAGETWO-94819: Swatch validation breaks the whole attribute form

Author: fascinosum

dev/tests/integration/testsuite/Magento/Catalog/Controller/Adminhtml/Product/AttributeTest.php

@@ -376,7 +376,8 @@ protected function _getAttributeData()
             'used_in_product_listing' => '1',
             'used_for_sort_by' => '0',
             'apply_to' => ['simple'],
-            'frontend_label' => [\Magento\Store\Model\Store::DEFAULT_STORE_ID => 'string to translate']
+            'frontend_label' => [\Magento\Store\Model\Store::DEFAULT_STORE_ID => 'string to translate'],
+            'serialized_options' => '[]',
         ];
     }
 }