Update nodemgmt-scripts.sh

nodemgmt-scripts.sh

@@ -505,7 +505,7 @@ CHECK_DOCKER_SERVICES(){
 		dockers=${NTYPE}_DOCKER[@]
 		hosts=${NTYPE}_HOSTS[@]
 		
-		if [ -n "${!dockers}" ]; then
+		if [[ -v ${!dockers} ]]; then
 			if [ "${ST_ACTION}" != "check" ]; then
 				echo -e "${idsST[Bold]}"; DIVIDER
 				echo -e "${idsCL[Yellow]} ${NM_NODETYPES[$NTYPE]}-Node Docker Service(s) Status${idsCL[Default]}"