Deploy: Display help if missing arguments

deployment_scripts/install-infection-monkey-service.sh

@@ -93,6 +93,7 @@ has_sudo() {
 exit_if_missing_argument() {
   if [ -z "$2" ] || [ "${2:0:1}" == "-" ]; then
     echo "Error: Argument for parameter '$1' is missing" >&2
+    echo_help
     exit 1
   fi
 }