Description

The canonical solution for HumanEval/111 (histogram) in the HumanEval+ dataset throws a ValueError when the input string contains only spaces, which contradicts the expected behavior.

Problem

The canonical solution attempts to call max() on an empty list when all words after splitting are empty strings:

Steps to Reproduce

histogram(" ")  # Single space
histogram("   ")  # Multiple spaces

Expected Behavior

Ideally, the function should return an empty dictionary {} for strings containing only spaces.

Actual Behavior

ValueError: max() iterable argument is empty