[System.Text.Json] Deserializing null array throws null-ref

[gnovack]

Passing "null" to JsonSerializer.Parse when deserializing arrays throws NullReferenceException.

int[] obj = JsonSerializer.Parse<int[]>("null");

//throws:
//Object reference not set to an instance of an object.
//at System.Text.Json.Serialization.JsonSerializer.ApplyObjectToEnumerable(Object value, JsonSerializerOptions options, ReadStack& state, Utf8JsonReader& reader, Boolean setPropertyDirectly)

[danmoseley]

Thanks. Interested in offering a PR with test?

[triynko]

I have a class with a property that's a list type. It has default set of items in it. When I Parse, it MERGES the items in the array rather than loading them. This duplicates data. With something so basic non-functioning, this library cannot be used at all.