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The TodaysHoliday tiddler has a problem: if today isn't a holiday, it says "It's today!". While true, that sounds a little silly, doesn't it? Change the tiddler so that if today is not a holiday, it instead says, "Sadly, it's a very ordinary day today."
Hint 1: If you don't remember how to make some wikitext appear only if a condition is met, have another read through Text Substitution.
Hint 2: An attribute called emptyMessage will come in handy.