insert jenkins username when job is triggered

Change-Id: Ia0226726735a2519567314729d7cd4778334f942
diff --git a/cicd-lab-pipeline.groovy b/cicd-lab-pipeline.groovy
index 26c2818..8726bd4 100644
--- a/cicd-lab-pipeline.groovy
+++ b/cicd-lab-pipeline.groovy
@@ -69,7 +69,11 @@
             if (HEAT_STACK_REUSE.toBoolean() == false) {
                 // Don't allow to set custom heat stack name
                 wrap([$class: 'BuildUser']) {
-                    HEAT_STACK_NAME = "${env.BUILD_USER_ID}-${JOB_NAME}-${BUILD_NUMBER}"
+                    if (env.BUILD_USER_ID) {
+                        HEAT_STACK_NAME = "${env.BUILD_USER_ID}-${JOB_NAME}-${BUILD_NUMBER}"
+                    } else {
+                        HEAT_STACK_NAME = "jenkins-${JOB_NAME}-${BUILD_NUMBER}"
+                    }
                     currentBuild.description = HEAT_STACK_NAME
                 }
             }