Recipe package system.

recipe_engine/third_party/expect_tests/main.py

Index: recipe_engine/third_party/expect_tests/main.py
diff --git a/recipe_engine/third_party/expect_tests/main.py b/recipe_engine/third_party/expect_tests/main.py
index 83800de232ab3d598c2facbb1e24af6ee2dd3a5a..fa211b37051320f31710dc3ec29c73692d7d60a5 100644
--- a/recipe_engine/third_party/expect_tests/main.py
+++ b/recipe_engine/third_party/expect_tests/main.py
@@ -51,7 +51,8 @@ class _test_completer(object):
 
 
 def _parse_args(args, test_gen):
-  args = args or sys.argv[1:]
+  if args is None:
+    args = sys.argv[1:]
 
   # Set the default mode if not specified and not passing --help
   search_names = set(HANDLERS.keys() + ['-h', '--help'])