Compare the upper loop(old) with the lower loop(new).Take a close look at the loop exit.
Solution: Right click the indexing tunnel and select "Enable Conditional Append"
This works not only with FOR-Loops.
History: This idea was already presented by me in May 2008 http://lavag.org/topic/7574-conditional-append/page__p__44719&#entry44719
Yes, this definitely needs to be a per-tunnel setting (and the question mark wasn't originally mine, it appears in the original illustration. I agree that it might be better not to have it).
Also, I've since learned that Jeff's suggestion can actually be done today. Feedback nodes have the ability to add a conditional terminal, thus allowing that to happen. I still don't like it, though.
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