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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.
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The problem is that you should first of all check to see if the sequence is invalid (=has invalid characters); one of the text cases deliberately give you something like '____' just to test that.
I am not the one who wrote the Python version, but basically any version works that way on purpose.
I hope that was clear enough and the issue can be considered fixed :)