From a9ee76f0338277ad28a359893365ca73c8346197 Mon Sep 17 00:00:00 2001
From: Antoine Nguyen <tonio@ngyn.org>
Date: Tue, 28 Apr 2015 19:11:20 +0200
Subject: [PATCH] Part of the fix for #715.

---
 modoboa/lib/form_utils.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/modoboa/lib/form_utils.py b/modoboa/lib/form_utils.py
index c52a94a39..f21a9a21d 100644
--- a/modoboa/lib/form_utils.py
+++ b/modoboa/lib/form_utils.py
@@ -223,6 +223,7 @@ class TabForms(object):
 
     def __init__(self, request, instances=None, classes=None):
         self.request = request
+        self.instances = {}
         to_remove = []
         for fd in self.forms:
             args = []
@@ -330,9 +331,12 @@ class TabForms(object):
             )
         context = {
             "tabs": self,
-            "action_label": _("Update"),
-            "action_classes": "submit",
         }
+        if self.forms:
+            context.update({
+                "action_label": _("Update"),
+                "action_classes": "submit",
+            })
         self.extra_context(context)
         active_tab_id = self.request.GET.get("active_tab", "default")
         if active_tab_id != "default":