Github user pvillard31 commented on the issue:
https://github.com/apache/nifi/pull/1974
@ijokarumawak - just pushed another commit to use flow file wherever
possible and added a unit test to confirm this solves NIFI-3590 as well. It
remains few ``getClient(null)`` and ``getChannel(null)`` but that's only when
there is no input allowed for the processor (listing operation).
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