MAGETWO-53134: Impossible resave customer on backend if he has address with optional state for country

Author: Sergii Kovalenko

app/code/Magento/Customer/view/base/ui_component/customer_form.xml

@@ -391,6 +391,7 @@
                 <item name="config" xsi:type="array">
                     <item name="dataType" xsi:type="string">text</item>
                     <item name="formElement" xsi:type="string">select</item>
+                    <item name="component" xsi:type="string">Magento_Ui/js/form/element/region</item>
                     <item name="source" xsi:type="string">address</item>
                     <item name="customEntry" xsi:type="string">region</item>
                     <item name="validation" xsi:type="array">