data include null value

[mefly521]

I use generateSchema covert the data to a josn. code like this:
var schema = generateSchema.json('Product', [ { "name": [{ "id": "123" }, { "id": null } ] } ])

Because my data have a null value in the id field, json like this "type":["string","null"] . I want to exclude the null . Dose generateSchema has a option of exclude null ?