Dont reset partition count to zero on metadata topic error
Dont reset partition count to zero on metadata topic error

A metadata partition count of 0 is returned by the broker with
errors such as "No leader broker" for a topic, since these errors are
typically intermittent we hold on to the existing partition count.

janmejay/librdkafka,janmejay/librdkafka,senior7515/librdkafka,orthrus/librdkafka,klonikar/librdkafka,klonikar/librdkafka,senior7515/librdkafka,orthrus/librdkafka,janmejay/librdkafka,klonikar/librdkafka,senior7515/librdkafka,orthrus/librdkafka,orthrus/librdkafka,janmejay/librdkafka,klonikar/librdkafka,senior7515/librdkafka