Update src/Microsoft.OpenApi/Reader/V2/OpenApiPathItemDeserializer.cs

Co-authored-by: Vincent Biret <[email protected]>

Author: MaggieKimani1

src/Microsoft.OpenApi/Reader/V2/OpenApiPathItemDeserializer.cs

@@ -55,8 +55,7 @@ private static void LoadPathParameters(OpenApiPathItem pathItem, ParseNode node,
             node.Context.SetTempStorage(TempStorageKeys.FormParameters, null);
 
             pathItem.Parameters = node.CreateList(LoadParameter, hostDocument)
-                                     .Where(p => p != null)
-                                     .Cast<IOpenApiParameter>()
+                                     .OfType<IOpenApiParameter>()
                                      .ToList();
 
             // Build request body based on information determined while parsing OpenApiOperation