Encodable also send nil values

[mansoor92]

public class ProductInput: Serializable {
@serialized
public var query: String?
required init() { }
}

//convert to data
let encoder = JSONEncoder()
let data = try! encoder.encode(ProductInput())

//print string
let jsonObject = try! JSONSerialization.jsonObject(with: data, options: [])
let dictionary = jsonObject as! [String:Any]
print(dictionary)

//result
▿ 1 elements
▿ 0 : 2 elements
- key : "query"
- value :