hal_json_style: support disabling URL columns with None

This is something we can do in TALES, it was supported in the old UI, so
we keep compatibility in HAL JSON API.
3 jobs for fix/hal_json_listbox_url_column_none in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

01:02:23

failed ERP5.PerformanceTest-TestRunner1

00:33:04

failed ERP5.UnitTest-TestRunner1

01:59:46