Allow empty autosuggest to suggest options

[Enerccio]

For some use cases empty autosuggest should show options but now it's hardcoded not to in js:

if (value.length > 0 && !this.opened) {
  this.opened = true;
} else if (value.length == 0 && this.opened) {
  this.opened = false;
}

This seems like an option that you should be able to choose.

Workaround:

autocomplete.setOptions(...);
autocomplete.getElement().executeJs("(function() { $0.opened=true; })()");