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TimeSeries factory returns filename instead of empty list when source parameter missing

TimeSeries factory returns filename instead of empty list when source parameter missing: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). When creating a TimeSeries without specifying a source parameter, the factory incorrectly returns the filename instead of an…

The task

When creating a TimeSeries without specifying a `source` parameter, the factory incorrectly returns the filename instead of an empty list or proper error handling. This breaks the expected behavior for unsupported or unrecognized file types.

Part of keryszhan/harbor-swesmith-rl-artifacts.