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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.
Get started now by creating a new collection.
I completly agree with that comment.
Adding a null check will solve this at the start of the function. It isn't too clear what to do for error case. I suppose returning 'null' would be ok, but throwing a new ArgumentNullException works too.