Use LookupError

kombu/transport/couchdb.py

@@ -67,7 +67,7 @@ class Channel(virtual.Channel):
 
         try:
             item = result[0]['value']
-        except (KeyError, IndexError):
+        except LookupError:
             raise Empty()
         self.client.delete(item['_id'])
         return loads(bytes_to_str(item['payload']))

kombu/transport/virtual/__init__.py

@@ -923,7 +923,7 @@ class Transport(base.Transport):
             while l:
                 try:
                     channel = l.pop()
-                except (IndexError, KeyError):  # pragma: no cover
+                except LookupError:  # pragma: no cover
                     pass
                 else:
                     channel.close()