templatetags: make sure |get_preference gets a user (#87741)

tests/admin_pages/test_all.py

@@ -2,6 +2,7 @@ import os
 
 import pytest
 
+from wcs.formdef import FormDef
 from wcs.qommon.http_request import HTTPRequest
 from wcs.qommon.ident.password_accounts import PasswordAccount
 
@@ -86,6 +87,10 @@ def test_admin_for_all(pub):
     user = create_superuser(pub)
     role = create_role(pub)
 
+    formdef = FormDef()
+    formdef.name = 'test'
+    formdef.store()
+
     try:
         with open(os.path.join(pub.app_dir, 'ADMIN_FOR_ALL'), 'w'):
             pass  # create empty file

wcs/qommon/templatetags/qommon.py

@@ -1281,7 +1281,7 @@ def intcomma(value):
 
 @register.filter
 def get_preference(user, pref_name):
-    return user.get_preference(pref_name)
+    return user.get_preference(pref_name) if user else None
 
 
 @register.simple_tag(takes_context=True)