The can_view_view function calls $view->get_owner_object without first
checking whether the view is owned by an individual user.

This change catches the case inside get_owner_object before triggering
the sql error.

Change-Id: Icf1ec4060dbe0621ea785fad73c3759bff36b25b
Signed-off-by: Richard Mansfield <richard.mansfield@catalyst.net.nz>