#24116: Webapi schema generation fail in case when Get endpoint has param with Extension Attributes.

Fix swagger generator.

Author: al.kravchuk

app/code/Magento/Webapi/Model/Rest/Swagger/Generator.php

@@ -705,7 +705,8 @@ protected function getQueryParamNames($name, $type, $description, $prefix = '')
      */
     private function handleComplex($name, $type, $prefix, $isArray)
     {
-        $parameters = $this->typeProcessor->getTypeData($type)['parameters'];
+        $typeData = $this->typeProcessor->getTypeData($type);
+        $parameters = $typeData['parameters'] ?? [];
         $queryNames = [];
         foreach ($parameters as $subParameterName => $subParameterInfo) {
             $subParameterType = $subParameterInfo['type'];