Don't render title row when title is empty

[meowgorithm]

I've run into this a few times where the context for the UI is presented elsewhere and we really just need the interactive portion of the component.

[jonas-grgt]

@meowgorithm I believe this has already been implemented at least for field_input.go as the View method contains the following:

	if i.title.val != "" || i.title.fn != nil {
		sb.WriteString(styles.Title.Render(i.title.val))
		if !i.inline {
			sb.WriteString("\n")
		}
	}