MAGETWO-45058: [IE9] impossible to create attribute in configurable product

Author: Oleksandr Dubovyk

app/design/adminhtml/Magento/backend/Magento_Catalog/web/css/source/_module.less

@@ -69,6 +69,8 @@ div.removed,
 //  ---------------------------------------------
 
 .catalog-product-attribute-edit {
+    min-width: 0;
+
     &.attribute-popup {
         .page-wrapper {
             width: 100%;