From dddf1d8ada2ef360e1cf471bdd1fd90767abc45b Mon Sep 17 00:00:00 2001
From: Hiroshi Miura <miurahr@linux.com>
Date: Sun, 24 Nov 2019 13:20:21 +0900
Subject: [PATCH] Fix error when no extra modules specified

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
---
 aqt/cli.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/aqt/cli.py b/aqt/cli.py
index 47f5c08..738e022 100644
--- a/aqt/cli.py
+++ b/aqt/cli.py
@@ -105,6 +105,8 @@ class Cli():
         return mirror
 
     def _check_modules_arg(self, qt_version, modules):
+        if modules is None:
+            return True
         result = True
         available = self.settings.available_modules(qt_version)
         for m in modules: