This seems like a bug to me... but it's such a basic use case that it then 
should have been discovered ages ago... so I'd better ask before issuing a 
report:

How can I make this return "no value" when there is no argument. Currently 
it returns "value" regardless or argument or no argument.

(direct link to SetWidget docs 
<https://tiddlywiki.com/prerelease/#SetWidget>)

\define foo(bar)
<$set name="myVariable" filter="$bar$" value="value" emptyValue="no value">
<$text text=<<myVariable>>/>
</$set>
\end

<<foo>>

Thanx

<:-)


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