Fix Warning: Warning: Undefined array key "columns" (#633)

Fix Warning: Undefined array key "columnConfig"

Author: ultramegatom

src/Configuration.php

@@ -423,7 +423,7 @@ public function getQueryColumnConfig($entityName)
      */
     public function getMutationColumnConfig($entityName)
     {
-        return $this->getMutationEntityConfig($entityName)['columnConfig'];
+        return $this->getMutationEntityConfig($entityName)['columnConfig'] ?? [];
     }
 
     /**

src/GraphQL/Mutation/MutationType.php

@@ -779,7 +779,7 @@ public function generateInputFieldsAndProcessors(&$inputFields, &$processors, $c
             /** @var Configuration $configurationItem */
             $configurationItem = $context['configuration'];
 
-            $columns = $configurationItem->getMutationColumnConfig($entity)['columns'];
+            $columns = $configurationItem->getMutationColumnConfig($entity)['columns'] ?? [];
 
             if ($columns) {
                 $fieldHelper = $this->getGraphQlService()->getObjectFieldHelper();