Index: /mergebot/trunk/mergebot/action_logic.py
===================================================================
--- /mergebot/trunk/mergebot/action_logic.py	(revision 31)
+++ /mergebot/trunk/mergebot/action_logic.py	(revision 32)
@@ -19,5 +19,5 @@
 def is_branchable(ticket):
     state = _get_mergebotstate(ticket)
-    return state == "" or state == "merged"
+    return state in [None, '', 'merged']
 
 def is_rebranchable(ticket):