--- _boto_single.py.orig	2012-02-29 19:24:04.000000000 +0000
+++ _boto_single.py	2014-01-13 09:04:02.689037053 +0000
@@ -257,7 +257,7 @@
 
     def list(self):
         if not self.bucket:
-            return []
+            raise BackendException("no connection to backend")
 
         for n in range(1, globals.num_retries+1):
             if n > 1:
--- _boto_multi.py.orig	2012-02-29 19:24:04.000000000 +0000
+++ _boto_multi.py	2014-01-13 09:04:42.961047274 +0000
@@ -272,7 +272,7 @@
 
     def list(self):
         if not self.bucket:
-            return []
+            raise BackendException("no connection to backend")
 
         for n in range(1, globals.num_retries+1):
             if n > 1: