fix: undefined error

Author: ChiragAgg5k

src/SDK/Language/Web.php

@@ -180,6 +180,12 @@ public function getParamExample(array $param): string
     public function getReadOnlyProperties(array $parameter, string $responseModel, array $spec = []): array
     {
         $properties = [];
+
+        if (!isset($spec['definitions'][$responseModel]['properties']) || 
+            !is_array($spec['definitions'][$responseModel]['properties'])) {
+            return $properties;
+        }
+        
         foreach ($spec['definitions'][$responseModel]['properties'] as $property) {
             if (isset($property['readOnly']) && $property['readOnly']) {
                 $properties[] = $property['name'];