emptyList check in Groovy

gistfile1.groovy

package io.geier

class IfTest {
    public static void main(String[] args) {
        List<String> emptyList = null;

        if (emptyList == null || emptyList.empty) {
            // return []
            println "AAA"
        }

        if (emptyList?.empty) {
            // return []
            println "BBB"
        }

        println "CCC"
    }
}

//
// OUTPUT:
// AAA
// CCC
//