Fix handling of NULL pointer in NativeClient::rebalance_protocol
#417
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The underlying function call `rdsys::rd_kafka_rebalance_protocol` can return a NULL pointer in the case of an error. The callers within librdkafka treat this similarly to it returning "NONE", so we will return `RebalanceProtocol::None` to emulate this behavior.
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The underlying function call
rdsys::rd_kafka_rebalance_protocolcanreturn a NULL pointer in the case of an error. The callers within
librdkafka treat this similarly to it returning "NONE", so we will
return
RebalanceProtocol::Noneto emulate this behavior.Closes #416