From 40fe51b3a980a9350b9b970905b82f340f25275e Mon Sep 17 00:00:00 2001
From: Helmut Merz <helmutm@cy55.de>
Date: Sun, 9 Mar 2025 10:32:46 +0100
Subject: [PATCH] fix DateField.sortValue (Py3): return 0 when None

---
 cco/common/report.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/cco/common/report.py b/cco/common/report.py
index f72a19a..7b6d965 100755
--- a/cco/common/report.py
+++ b/cco/common/report.py
@@ -67,11 +67,12 @@ class DateField(BaseDateField):
 
     def getSortValue(self, row):
         value = self.getRawValue(row)
-        if value is not None:
+        if value:
             value = date2TimeStamp(value)
             if getattr(self, 'sortDesc', False):
                 value = -value
-        return value
+            return value
+        return 0
 
 
 class IntegerField(BaseIntegerField):