storage: guard fetchConsumer against recreated topics - #871
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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Fixes #864. When a topic is deleted and recreated between the consumer snapshot and the broker read, fetchConsumer can hit a partition ring with no offsets (index out of range [-1] at the BrokerOffsets read) or a broker partition list shorter than the consumer's (out of range on topicMap[p]). Both now degrade to returning the consumer data without lag for the affected partitions, same as the existing missing-topic case. Added tests that construct both inconsistent states directly; each panics without the guards.