Fix: Undefined index: duplicates_view

Author: blankse

src/DependencyInjection/Configuration.php

@@ -378,6 +378,7 @@ private function buildCustomerDuplicatesServicesNode()
                 ->end()
 
                 ->arrayNode('duplicates_view')
+                    ->addDefaultsIfNotSet()
                     ->children()
                         ->booleanNode('enabled')->defaultFalse()->end()
                         ->arrayNode('listFields')
@@ -391,6 +392,7 @@ private function buildCustomerDuplicatesServicesNode()
                 ->end()
 
                 ->arrayNode('duplicates_index')
+                    ->addDefaultsIfNotSet()
                     ->children()
                         ->booleanNode('enableDuplicatesIndex')
                             ->defaultFalse()