Cannot pass empty value of --build-arg

[LinuxSuRen]

Actual behavior
I tried to give ARG an empty value, but it's failed. The ARG still uses the default value. See below Dockerfile

ARG REGISTRY=172.11.0.6:30002/
FROM ${REGISTRY}docker.io/library/golang:1.20 as builder

when I run the following command,

docker run -v .:/data gcr.io/kaniko-project/executor:latest \ --no-push --dockerfile=/data/Dockerfile --build-arg REGISTRY=''

it still pulls image from 172.11.0.6:30002/docker.io/library/golang:1.20

Expected behavior
It can pull image from docker.io/library/golang:1.20

To Reproduce
See above.

Additional Information

• Dockerfile
  Please provide either the Dockerfile you're trying to build or one that can reproduce this error.
• Build Context
  Please provide or clearly describe any files needed to build the Dockerfile (ADD/COPY commands)
• Kaniko Image (fully qualified with digest)

Triage Notes for the Maintainers

Description	Yes/No
Please check if this a new feature you are proposing
Please check if the build works in docker but not in kaniko
Please check if this error is seen when you use --cache flag
Please check if your dockerfile is a multistage dockerfile