fix: Prevent multiple additions of same element by checking for null node UID
fix: Prevent multiple additions of same element by checking for null node UID

SvitlanaShepitsena/framework-1,SvitlanaShepitsena/shakou,ildarsamit/framework,infamous/famous-framework,ildarsamit/framework,KraigWalker/framework,woltemade/framework,woltemade/framework,colllin/famous-framework,SvitlanaShepitsena/shakou,SvitlanaShepitsena/framework,SvitlanaShepitsena/remax-banner,infamous/framework,jeremykenedy/framework,tbossert/framework,colllin/famous-framework,KraigWalker/framework,jeremykenedy/framework,SvitlanaShepitsena/framework-1,SvitlanaShepitsena/framework,infamous/framework,Famous/framework,SvitlanaShepitsena/remax-banner,infamous/famous-framework,tbossert/framework,Famous/framework