MidnightLightning

Partial answer for you, but FYI the standard google groups is appropriate 
for this kind of question and you may get a faster response there.

Rather than count the tags $list <https://tiddlywiki.com/#ListWidget> the 
tags with limit[1] and the content of the list widget will only show if 
there are more than one tag.

[tag<currentTiddler>limit[1]]

You could use emptyMessage if you wanted.

In other circumstances (except variables at present) you can use the View 
widget, as The content of the <$view> widget is displayed if the field or 
property is missing or empty.

Regards
Tony

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