[fix][broker] fix MessageDeduplication throw NPE when enable broker dedup and set namespace disable deduplication. - #20905

[fix][broker] fix MessageDeduplication throw NPE when enable broker dedup and set namespace disable deduplication.#20905

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lifepuzzlefun:fix_npe_when_disable_namespace_deduplication_and_broker_deduplication_is_enabledlifepuzzlefun/pulsar:fix_npe_when_disable_namespace_deduplication_and_broker_deduplication_is_enabledCopy head branch name to clipboard