Default to an empty collection if examples is null

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/V2/OpenApiResponseDeserializer.cs

@@ -73,7 +73,8 @@ private static void ProcessProduces(MapNode mapNode, OpenApiResponse response, P
                 ?? context.DefaultContentType ?? new List<string> { "application/octet-stream" };
 
             var schema = context.GetFromTempStorage<OpenApiSchema>(TempStorageKeys.ResponseSchema, response);
-            var examples = context.GetFromTempStorage<Dictionary<string, OpenApiExample>>(TempStorageKeys.Examples, response);
+            var examples = context.GetFromTempStorage<Dictionary<string, OpenApiExample>>(TempStorageKeys.Examples, response)
+                ?? new Dictionary<string, OpenApiExample>();
 
             foreach (var produce in produces)
             {