When such a view has arguments, though, the call to strpos('$arg', $url) (with $url = empty string) in views_get_url issues a warning :
Warning: strpos(): Empty delimiter. in (...)\modules\views\views.module on line 745
The below solution could resolve our problem.
- having the url compulsory at view form validation time if "provide page view" is checked;
the description for the "url" textfield reads as if it is the case, but it's not (and for the time being it is not)