[select] Placeholder is not shown when there are no items

[MatthewVaadin]

Description

If I have a Select component with no items set and a placeholder text set, the placeholder text is not shown. If the select has items, the placeholder is shown.

Expected outcome

I would expect the placeholder text to be shown whether there are any items or not.

Minimal reproducible example

Select<String> emptySelect = new Select<>();
emptySelect.setLabel("Empty select");
emptySelect.setPlaceholder("Select an item");
add(emptySelect);

Select<String> unselectedSelect = new Select<>();
unselectedSelect.setItems("One", "Two", "Three");
unselectedSelect.setLabel("Unselected select");
unselectedSelect.setPlaceholder("Select an item");
add(unselectedSelect);

Steps to reproduce

1. Add the snippet above to a view.
2. Visit the view and notice that the top select has no placeholder, whereas the bottom one has.

Environment

Vaadin version(s): 24.5

Browsers

No response