<div>
  When checked, the build can be started with nothing selected, which submits an empty list.
  When unchecked, at least one entry must be selected.
  <br/>
  An endpoint response that yields no values (or none left after the filter) is then treated as valid:
  no error is shown on the build form and the build can be started with an empty list.
  <p>
    Empty entries within a list are always rejected, whatever this option is set to.
  </p>
</div>