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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Empty arrays are no longer possible.
This is the common mathematical definition of an empty product. Note that also
a^0denotes kind of an empty product (you multiply zeroas) and we all would agree that this equals to1. (Or maybe not agree, but still we learned this in school) See also https://en.wikipedia.org/wiki/Empty_productAnd it wants the product of an empty array to be 1. I'd have thought 0 made more sense.
Sorry, but not an issue ;-)