From 4cbd9dfa0a28db6ae2b7a89daaf3ddccd25bccce Mon Sep 17 00:00:00 2001
From: mhucka <mhucka@caltech.edu>
Date: Fri, 8 Jul 2022 18:09:20 -0700
Subject: [PATCH] Fix #5702

If no argument is given to modules.py, pretend --help was given.
---
 dev_tools/modules.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dev_tools/modules.py b/dev_tools/modules.py
index 9fd5ecdbc25..2618b8921bb 100644
--- a/dev_tools/modules.py
+++ b/dev_tools/modules.py
@@ -303,6 +303,9 @@ def parse(args):
 
 
 def main(argv: List[str]):
+    if argv == []:
+        # If no arguments are given, print the help/usage info.
+        argv = ['--help']
     args = parse(argv)
     # args.func is where we store the function to be called for a given subparser
     # e.g. it is list_modules for the `list` subcommand