Fix minor typo in generator_bootstrap_new_cluster leading to issues in some cases

Change-Id: Ic87d43e307119dddc85d4c146bbd484d8e35adfb
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/docker/osm-krm-functions/scripts/library/krm-functions.rc b/docker/osm-krm-functions/scripts/library/krm-functions.rc
index 1d45705..c006729 100644
--- a/docker/osm-krm-functions/scripts/library/krm-functions.rc
+++ b/docker/osm-krm-functions/scripts/library/krm-functions.rc
@@ -577,7 +577,7 @@
 # Generate bootstrap manifests for new cluster from the management cluster
 function generator_bootstrap_new_cluster() {
   local CLUSTER_NAME="$1"
-  local CLUSTER_KUSTOMIZATION_NAME="${2:$(safe_name ${CLUSTER_NAME})}"
+  local CLUSTER_KUSTOMIZATION_NAME="${2:-$(safe_name ${CLUSTER_NAME})}"
   local CLUSTER_AGE_SECRET_NAME="${3:-$(safe_name "sops-age-${CLUSTER_KUSTOMIZATION_NAME}")}"
   local SW_CATALOGS_REPO_DIR="${4:-"${SW_CATALOGS_REPO_DIR}"}"