Removing NSNull check that sometimes crashes on linux

Author: nerdsupremacist

Sources/GraphZahl/Utils/MethodInfo+resolve.swift

@@ -104,9 +104,6 @@ extension MethodInfo {
         } as [Any]
 
         let result = try self.call(receiver: receiver, arguments: arguments)
-        if result is NSNull {
-            return eventLoop.next().makeSucceededFuture(Optional<Int>.none)
-        }
 
         // TODO: for some reason this breaks with arrays...
         // this will break the server if we ever return [Future<T>]