[mhonarc] handle_message: if new path is unknown, return old path

[Olav Vitters <ovitters src gnome org>]

commit cd38fb6d3d9e0ddc8d2e9bbc47968b390cedc7ba
Author: Olav Vitters <olav vitters nl>
Date:   Wed Feb 13 15:59:39 2013 +0100

    handle_message: if new path is unknown, return old path

 archive.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/archive.py b/archive.py
index c68b3bb..1fd010b 100755
--- a/archive.py
+++ b/archive.py
@@ -177,7 +177,7 @@ class Archiver:
         fd.seek(0)
         shutil.copyfileobj(fd, newmsgs)
 
-        return path
+        return path if path is not None else archivepath
 
     def process_fd(self, fd):
         """Process a filedescriptor for multiple emails seperated using the mbox format