NSNull case was handled for nullable selections

[Sundea]

Fix for the https://github.com/maticzav/swift-graphql/issues/89

I've found that value of AnyCodable is Optional<Any> - some : in that cases. It's not nil. So, instead of void, we receive a "value" while decoding and decoder fails

(lldb) po value
▿ Optional<Any>
  - some : <null>
 
(lldb) po value == nil
false

@frozen public struct AnyCodable: Codable {
    public let value: Any

    public init<T>(_ value: T?) {
        self.value = value ?? ()
    }
}

But the nullable selection handles only void case

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Name	Status	Preview	Updated
swift-graphql	✅ Ready (Inspect)	Visit Preview	Sep 14, 2022 at 4:35PM (UTC)

[maticzav]

Sweet, thanks!