misc: fix |has_role filter used on bad object (#62439)

combo/public/templatetags/combo.py

@@ -320,7 +320,7 @@ def shown_because_admin(cell, request):
 
 @register.filter(name='has_role')
 def has_role(user, groupname):
-    if not user or user.is_anonymous:
+    if not user or getattr(user, 'is_anonymous', True):
         return False
     if not hasattr(user, 'groups'):
         return False

tests/test_public_templatetags.py

@@ -116,6 +116,10 @@ def test_has_role():
     t = Template('{{ selected_user|has_role:"Role2" }}')
     assert t.render(context) == 'False'
 
+    # filter not on user object
+    t = Template('{{ request|has_role:"Role1" }}')
+    assert t.render(context) == 'False'
+
 
 def test_get():
     t = Template('{{ foo|get:"foo-bar" }}')