Update nodemgmt-scripts.sh

nodemgmt-scripts.sh

@@ -779,7 +779,7 @@ RUN_COMMAND(){
 		shift
 	done
 	echo "NODETYPE1= '${nodetype}'"
-	if [ "${nodetype}" == "ALL" ] || [ -n ${nodetype} ]; then
+	if [ "${nodetype}" == "ALL" ] || [ -z ${nodetype+x} ]; then
 		echo 1
 		nodetype=ALL
 		NT_HOSTS=ALL_HOSTS[@]