NIFI-4656, NIFI-4680: Fix error handling in consume/publish kafka pro…

[markap14]

…cessors. Address issue with HortonworksSchemaRegistry throwing RuntimeException when it should be IOException. Fixed bug in ConsumeerLease/ConsumKafkaRecord that caused it to report too many records received

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[joewitt]

makes sense here just to catch IOException in a block and the general Exception in the following block, nO?

[markap14]

Blurgh, yes, sorry. Will address & push.