Github user hmcl commented on the issue:
https://github.com/apache/storm/pull/1999
@srdo we can make de default emit null. That's a trivial change. As I said,
I decided not to emit null because that is the default behavior in the old
spout, and users are either happy, or used to it. I am not in favor or one way
or another. It's just that emitting null tuples, unforeseen problems can
potentially happen downstream.
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