in app-gradle-plugin/src/main/java/com/google/cloud/tools/gradle/appengine/core/DeployTargetResolver.java [89:100]
public String getVersion(String configString) {
if (configString == null
|| configString.trim().isEmpty()
|| configString.equals(APPENGINE_CONFIG)) {
throw new GradleException(VERSION_ERROR);
}
if (configString.equals(GCLOUD_CONFIG)) {
// can be null to allow gcloud to generate this
return null;
}
return configString;
}