ifeval_rule_reward_worker bug

1. else 后还要加个 `result = False`，否则 result 可能未定义，导致后面抛异常

https://github.com/alibaba/ROLL/blob/445a029c5c2cc75cf0dc896b3c5bcd72eda1ee2b/roll/pipeline/rlvr/rewards/ifeval_rule_reward_worker.py#L635

2. 这里 continue 之前需要加个 `repetition_penalty_rewards.append(0.0)`，否则 repetition_penalty_rewards 维度和 results 不一致，导致后面相加时会变成短的，转tensor时抛异常

https://github.com/alibaba/ROLL/blob/445a029c5c2cc75cf0dc896b3c5bcd72eda1ee2b/roll/pipeline/rlvr/rewards/ifeval_rule_reward_worker.py#L621

Open roll/pipeline/rlvr/rewards/ifeval_rule_reward_worker.py around lines 621 and 635 and inspect the branches described in the issue. Verify that the result variable is defined after the else branch and that repetition_penalty_rewards stays aligned when continue is reached, then run the relevant available checks to confirm tensor conversion no longer fails.

Written by the indexing model from the issue text.