Openshift DSL imagestreamtag exists

gistfile1.txt

pipeline {
    agent any
    
    environment {
        def imageStreamTagExists = false
    }
    
    stages {
        stage('Image stream tag') {
            steps {
                script {
                    openshift.withCluster() {
                        openshift.withProject("project") {
                            imageStreamTagExists = openshift.selector("imagestreamtag", "appname:1.0.0").exists()
                            echo "Image Stream Tag exists? ${imageStreamTagExists}"
                        }
                    }
                }
            }
        }
        stage('Testing') {
            when {
                expression {
                    !imageStreamTagExists
                }
            }
            steps {
                script {
                    echo "Do not exist"
                }
            }
        }
    }
}