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Modify the template you created in Ex:WikipediaLinkTemplate so that if the articleName
variable is not defined, the article name will instead be taken from the articlename
field of the current tiddler.
else
filter operator, which adds a constant string to the pipeline if there are no input tiddlers, will be useful here. You will also need to put !is[blank]
before the else
operator – we'll explain why once you've completed this exercise.