[test_compat] Avoid None values for compat_setenv

diff --git a/test/test_compat.py b/test/test_compat.py
index afe6bd5282ee857f409ef275459dcb4cc5f1f274..b208142493a5b868cb0bc1ffbb7c1e1f32d922fe 100644 (file)
--- a/test/test_compat.py
+++ b/test/test_compat.py
@@ -42,7 +42,7 @@ class TestCompat(unittest.TestCase):
         test_str = 'C:\Documents and Settings\тест\Application Data'
         compat_setenv('HOME', test_str)
         self.assertEqual(compat_expanduser('~'), test_str)
-        compat_setenv('HOME', old_home)
+        compat_setenv('HOME', old_home or '')
 
     def test_all_present(self):
         import youtube_dl.compat