admin: fixed traceback for objects with no change page in the admin

django_journal/admin.py

@@ -51,10 +51,10 @@ class JournalAdmin(admin.ModelAdmin):
         url = '{0}:{1}_{2}_change'.format(self.admin_site.name,
                 obj_data.content_type.app_label,
                 obj_data.content_type.model)
-        #try:
-        url = reverse(url, args=(obj_data.object_id,))
-        #except NoReverseMatch:
-        #    return ''
+        try:
+            url = reverse(url, args=(obj_data.object_id,))
+        except NoReverseMatch:
+            return ''
         return '<a href="%s" class="external-link"></a>' % url
 
     def html_message_no_filter(self, entry):