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You have to provide something for the nothing option!
You could try some of these values (untested): ' ', '&_nbsp;','-', '.'
The first suggestion is a single space character, the forum’s parser may corrupt my intention. The second should be a non-breaking space HTML entity code, but you need to remove the underscore I inserted to prevent the parser from rendering the actual character. The last two are not nothing, but are minimal and unobtrusive.
Perfect, the single space character is what I wanted