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Keep weighted_distribution_ in sync with records_ when pruning all-zero weights. - #2275
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…l-zero weights. When all corpus inputs have weight zero, `WeightedDistribution::RemoveRandomWeightedSubset` removes every entry from `weighted_distribution_` before returning `subset_to_remove`. `Corpus::Prune` then erases one index from `subset_to_remove` so `records_` retains one random input, leaving `weighted_distribution_` empty and causing check failures on subsequent corpus operations. Restore one zero weight in `weighted_distribution_` when keeping that fallback input, and add a unit test covering `Corpus::Prune` with all-zero weights. PiperOrigin-RevId: 1000889284
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Keep
weighted_distribution_in sync withrecords_when pruning all-zero weights.When all corpus inputs have weight zero,
WeightedDistribution::RemoveRandomWeightedSubsetremoves every entry fromweighted_distribution_before returningsubset_to_remove.Corpus::Prunethen erases one index fromsubset_to_removesorecords_retains one random input, leavingweighted_distribution_empty and causing check failures on subsequent corpus operations.Restore one zero weight in
weighted_distribution_when keeping that fallback input, and add a unit test coveringCorpus::Prunewith all-zero weights.