From 219cb5b1308c2e3ac5f8de98993de2660b309a30 Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@peacefrogs.net>
Date: Wed, 10 Apr 2013 18:37:57 +0200
Subject: Fix crash on file creation (fixes #1212)

---
 archaeological_operations/wizards.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/archaeological_operations/wizards.py b/archaeological_operations/wizards.py
index 4205144e6..83bf3f21c 100644
--- a/archaeological_operations/wizards.py
+++ b/archaeological_operations/wizards.py
@@ -157,7 +157,7 @@ class OperationWizard(Wizard):
                 except (ValueError, IndexError):
                     continue
                 keys.add(items[-1])
-            if max(numbers) - 1:
+            if numbers and max(numbers) - 1:
                 initial = [dict([(k, data[step+'-'+unicode(max(numbers)-1)+'-'+k])
                                            for k in keys if k != 'parcel_number'])]
             self.form_initialized = True
-- 
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