From 00fbd98f97e9c09510a2466c6a30909082bc0329 Mon Sep 17 00:00:00 2001
From: Brian Coca <brian.coca+git@gmail.com>
Date: Wed, 2 Nov 2016 10:15:51 -0400
Subject: [PATCH] dont join when group is none

---
 lib/ansible/modules/system/user.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/ansible/modules/system/user.py b/lib/ansible/modules/system/user.py
index fba0c11753a..272acd5678b 100644
--- a/lib/ansible/modules/system/user.py
+++ b/lib/ansible/modules/system/user.py
@@ -262,7 +262,6 @@ class User(object):
         self.non_unique  = module.params['non_unique']
         self.seuser     = module.params['seuser']
         self.group      = module.params['group']
-        self.groups     = ','.join(module.params['groups'])
         self.comment    = module.params['comment']
         self.shell      = module.params['shell']
         self.password   = module.params['password']
@@ -282,6 +281,10 @@ class User(object):
         self.update_password = module.params['update_password']
         self.home    = module.params['home']
         self.expires = None
+        self.groups = None
+
+        if module.params['groups'] is not None:
+            self.groups = ','.join(module.params['groups'])
 
         if module.params['expires']:
             try: