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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.
You are absolutely correct. It is weird that the problem only occurs with one of the tests instead of all of them, but not mutating the input solved the problem nonetheless!
As previously mentioned, the Glider 4 test in Python expects an incorrect result, making the Kata impossible to complete.
The expected result in Glider 4 has untrimmed empty rows and columns.