Fix bug in prepare_experiment.sh

templates/event-generator/prepare_experiment.sh

@@ -20,7 +20,9 @@ mkdir -p "${COMMON_INIDATA_FOLDER}"
 cd "${COMMON_INIDATA_FOLDER}" || exit
 
 # Change permissions
-chmod 660 ./*
+if [ "$(ls -A .)" ]; then
+  chmod 660 ./*
+fi
 
 # Download or copy required input files
 function download_file() {