Using JsonConverter on a property that is sometimes missing, as well as checking for single item or array

Question

In the Json deserialization model, I have a class member that can be a single item or an array, thus I use a JsonConverter to deal with it. However, sometimes the entire property is missing in the response as well. The model has a property that the Json response sometimes does not, so I am using [JsonProperty(Required = Required.Always)].

public class Reservation
{

    [JsonConverter(typeof(SingleOrArrayConverter<Resource_Reservation>))]
    [JsonProperty(Required = Required.Always)]
    public List<Resource_Reservation> resource_reservation { get; set; }

The problem is when missing class property passes through the ReadJson method in the JsonConverter, it raises exception.

My question is whether I can add missing property logic check in the JsonConverter, or do I need to deal with the exception as is.