Github user joewitt commented on the issue:
https://github.com/apache/nifi/pull/1564
@joetrite actually looks like the logic bug causing things to route to
success when no attributes match at all would only apply to the 'allMatch' case
and it is because it returns true if it never returns false. If line 228 took
into account that the attribute matcher had more than one hit it would do the
job. something like 'return howeverManyHitsWeSaw > 0'
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