If there are no remotes, return empty list, not None.  The later doesn't
work with builtin set().

This fixes t1001-branch-rename.sh

Signed-off-by: Pavel Roskin <proski@gnu.org>
---

 stgit/git.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/stgit/git.py b/stgit/git.py
index 4b4c626..f847cce 100644
--- a/stgit/git.py
+++ b/stgit/git.py
@@ -953,7 +953,7 @@ def __remotes_from_dir(dir):
     if os.path.exists(d):
         return os.listdir(d)
     else:
-        return None
+        return []
 
 def remotes_list():
     """Return the list of remotes in the repository
-
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