--- archivemail.orig	2007-08-15 19:41:25.000000000 +0200
+++ archivemail	2007-08-15 22:27:24.000000000 +0200
@@ -1262,7 +1262,10 @@
         original = mailbox.MHMailbox(mailbox_name)
     else:
         unexpected_error("unknown type: %s" % type)        
-    assert(original)
+    if not original:
+        if not options.quiet:
+            print "Maildir is empty, exiting."
+        return
 
     cache = IdentityCache(mailbox_name)