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fix empty list validation and code data structures (#826)

* fix empty list validation and code data structures

* Update bucket_sort.py

https://github.com/TheAlgorithms/Python/pull/826#pullrequestreview-240357549
N
Níkolas Vargas committed
023f5e092d38f7e220ae68a23f7183eeb8fd9e04
Parent: b5667e5
Committed by John Law <johnlaw.po@gmail.com> on 5/22/2019, 12:09:36 PM