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I honestly prefer using verbose messages over inserting random nils in where I expect a list. Even if said list is empty. Perhaps if you kept track if the loop has printed anything and at the end, saying "List is empty" if it hasn't printed anything. Using indents, even in your output can give more info on the structure of data being examined too.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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