fix: empty stream for non-positive partition_all n - #238
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partition_all(0, seq) raised ZeroDivisionError on len % n, and negative n raised SystemError from PyTuple_New. Match toolz by yielding an empty stream when n < 1.
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partition_all hits ZeroDivisionError when partition_all(0, seq) modulo by zero vs toolz empty. This PR fixes the regression with a focused test covering the case.