From 75794b5e48735ee16616dde5c5bbf5e122d4308c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20Koci=C3=A1n?= <matej.kocian@gmail.com>
Date: Fri, 21 Apr 2017 22:56:46 +0200
Subject: [PATCH] =?UTF-8?q?Admin:=20fix=20odkazu=20na=20=C4=8D=C3=ADslo=20?=
 =?UTF-8?q?zad=C3=A1n=C3=AD/=C5=99e=C5=A1en=C3=AD?=
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---
 seminar/admin.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/seminar/admin.py b/seminar/admin.py
index cdb9f3fc..1532b54d 100644
--- a/seminar/admin.py
+++ b/seminar/admin.py
@@ -495,6 +495,8 @@ class ProblemZadanyAdmin(ProblemAdmin):
     ]
 
     def cislo_zadani_link(self, obj):
+        if not obj.cislo_zadani:
+            return ""
         return mark_safe('<a href="{}">{}</a>'.format(
             reverse("admin:seminar_cislo_change", args=(obj.cislo_zadani.pk,)),
             obj.cislo_zadani
@@ -505,6 +507,8 @@ class ProblemZadanyAdmin(ProblemAdmin):
     # nějak zjednodušit, např. tímto?
     # https://github.com/gitaarik/django-admin-relation-links
     def cislo_reseni_link(self, obj):
+        if not obj.cislo_reseni:
+            return ""
         return mark_safe('<a href="{}">{}</a>'.format(
             reverse("admin:seminar_cislo_change", args=(obj.cislo_reseni.pk,)),
             obj.cislo_reseni