From 2b3d6d4545619387c1920fc5488a92e908441662 Mon Sep 17 00:00:00 2001
From: Bowe Strickland <bowe@yak.net>
Date: Wed, 23 Jan 2013 13:55:12 -0500
Subject: [PATCH] protect PluginLoader._extra_dirs from appending None
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PluginLoader.add_directory() can receive None from, for example, 
Inventory.add_directory(self.basedir()) if host_list is a custom list.
None has no reasonable interpretation other than ignore it.
---
 lib/ansible/utils/plugins.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/ansible/utils/plugins.py b/lib/ansible/utils/plugins.py
index 3a6d9947a9c..2af819b1813 100644
--- a/lib/ansible/utils/plugins.py
+++ b/lib/ansible/utils/plugins.py
@@ -70,7 +70,8 @@ class PluginLoader(object):
 
     def add_directory(self, directory):
         """Adds an additional directory to the search path"""
-        self._extra_dirs.append(directory)
+        if directory is not None:
+            self._extra_dirs.append(directory)
 
     def print_paths(self):
         """Returns a string suitable for printing of the search path"""