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cd2d1395 - [ty] Avoid panic from double inference with missing functional Enum names (#24638)

[ty] Avoid panic from double inference with missing functional Enum names (#24638) ## Summary Given `Enum("Color")`, we inferred the first argument, then returned `None` later if `names_arg` was empty, which led us to double-infer the first argument. Closes https://github.com/astral-sh/ty/issues/3272.