exceptionfactory commented on PR #11578:
URL: https://github.com/apache/nifi/pull/11578#issuecomment-5426231609

   Thanks @ing-mattioni. One straightforward option is to add the `isBlank()` 
check and throw the same exception, but not route to `failure`. It is arguable 
that lack of the Routing Key is a configuration problem, which makes the 
exception the more applicable approach. If input FlowFiles may or may not have 
the required attributes, it would be better to design the flow accordingly, 
using `RouteOnAttribute` or similar.


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