Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the null and undefined errors pattern
Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.
What went wrong: max() has no answer for an empty list, so it raises an error.
The fix: return max(scores, default=0)
Remember: test max, min and averages with an empty list.
The pattern behind it: null and undefined errors.
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