From 35490794fa5ce9ce6e260edca518ac483c537158 Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Tue, 26 Jun 2012 15:31:08 +0200
Subject: [PATCH] accept other values as empty (not only None), e.g. for group
 header fields

---
 expert/field.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/expert/field.py b/expert/field.py
index 476a871..7ee201a 100644
--- a/expert/field.py
+++ b/expert/field.py
@@ -184,7 +184,7 @@ class RelationField(Field):
 
     def getDisplayValue(self, row):
         value = self.getValue(row)
-        if value is None:
+        if not value:
             return dict(title=u'', url=u'')
         nv = row.parent.context.view.nodeView
         return dict(title=getattr(value, self.displayAttribute),