Fix a coding error that was introduced in 26423.

"file_list = file_list or []" would create a new empty list when an empty list is passed as a parameter, ditching the output parameter.

TEST=hooks are now run on gclient sync
BUG=none

Review URL: http://codereview.chromium.org/208010


git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@26461 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -51,8 +51,8 @@ class SCMWrapper(object):
 
   def RunCommand(self, command, options, args, file_list=None):
     # file_list will have all files that are modified appended to it.
-
-    file_list = file_list or []
+    if file_list is None:
+      file_list = []
 
     commands = {
       'cleanup':  self.cleanup,