silence ls in script_setup.sh

script_setup.sh

@@ -20,7 +20,7 @@ if grep -i centos /etc/redhat-release &>/dev/null; then
 
 	# Extend python path for externals (mailinglogger)
 	EXTERNAL_PYTHON_DIR="/sw/atlas/tdaq/$TDAQ_RELEASE/installed/external/$CMTCONFIG/lib/python3.7/site-packages/"
-	if ! ls $EXTERNAL_PYTHON_DIR; then
+	if ! ls $EXTERNAL_PYTHON_DIR &>/dev/null; then
 		echo "error: cannot find external python packages in $EXTERNAL_PYTHON_DIR"
 		return 1
 	fi