empty tag not found about leaf HOT 4 CLOSED

import Foundation
import Vapor
import Leaf

class Empty: BasicTag {
    let name = "empty"
    
    func run(arguments: [Argument]) throws -> Node? {
        guard arguments.count > 0 else {
            return Node("empty")
        }
        for arg in arguments {
            guard let val = arg.value, !val.isNull else  {
                return Node("empty")
            }
            if let arr = val.array, arr.count == 0 {
                return Node("empty")
            }
            
            if let dico = val.nodeObject, dico.count == 0 {
                return Node("empty")
            }
        }
        
        return nil
    }
}