Github user joewitt commented on the issue:
https://github.com/apache/nifi/pull/1564
@joetrite that sounds like a good catch then and it should be fixed. The
docs say "at least one must match" or "all must match" so there is no cause for
'none matched (even if no attributes)' going to matched. It should go to
unmatched. That is probably good for another JIRA/PR but if you want to do
that in here I'm ok with that too personally. Or if you just want to raise the
JIRA/PR but not tackle that this is ok too.
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