From 6491d63714283df6147d61c0964e24bee67d1159 Mon Sep 17 00:00:00 2001
From: Jonas Havelka <jonas.havelka@moznabude.cz>
Date: Thu, 3 Sep 2020 16:12:50 +0200
Subject: [PATCH] =?UTF-8?q?Fix=20organiz=C3=A1tor=20musel=20m=C3=ADt=20vyp?=
 =?UTF-8?q?ln=C4=9Bn=C3=A9=20organizuje=20od=20/=20do,=20jinak=20vyhazoval?=
 =?UTF-8?q?o=20chybnou=20chybu?=
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---
 seminar/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/seminar/models.py b/seminar/models.py
index deb0c9b9..79d08eae 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -582,7 +582,7 @@ class Organizator(SeminarModelBase):
 		"školu, ale jen obor, možnost zobrazit zvlášť")
 
 	def clean(self):
-		if self.organizuje_od > self.organizuje_do:
+		if self.organizuje_od and self.organizuje_do and (self.organizuje_od > self.organizuje_do):
 			raise ValidationError("Organizátor nemůže skončit s organizováním dříve než začal!")
 		super().clean()